The answer is that as always; we need to avoid being too cautious vs. being too permissive. Authentication-Results: spf=none (sender IP is 118.69.226.171) smtp.mailfrom=kien.ngan; thakrale5.onmicrosoft.com; dkim=none (message not signed) header.d=none;thakrale5.onmicrosoft.com; dmarc=none action=none header.from=thakrale5.onmicrosoft.com; Received-SPF: None (protection.outlook.com: kien.ngan does not designate permitted sender hosts) Q8: Who is the element which is responsible for alerting users regarding a scenario in which the result of the SPF sender verification test is Fail? Login at admin.microsoft.com, Expand Settings and select Domains Select your custom Domain (not the .onmicrosoft.com domain, Click on the DNS Records tab.If you have bought a license that includes Exchange Online then the required Office 365 SPF record will be shown here, Click on the TXT (SPF) record to open it. Also, if you're using DMARC with p=quarantine or p=reject, then you can use ~all. ip4: ip6: include:. Can we say that we should automatically block E-mail message which their organization doesnt support the use of SPF? This type of configuration can lead us to many false-positive events, in which E-mail message that sent from our customer or business partner can be identified as spam mail. Instead, the E-mail message will be forwarded to a designated authority, such as IT person, that will get the suspicious E-mail, and this person will need to carefully examine the E-mail and decide if the E-mail is indeed spoofed E-mail or a legitimate E-mail message that mistakenly identified as Spoof mail. Nearly all large email services implement traditional SPF, DKIM, and DMARC checks. This phase is described as learning mode or inspection mode because the purpose of this step has been just to identify an event of a Spoof mail attack in which the hostile element uses an E-mail address that includes our domain name + Log this information. In the current article, I want to provide you with a useful way, to implement a mail security policy related to an event in which the result of the SPF sender verification check is Fail. If we want to be more precise, an event in which the SPF sender verification test result is Fail, and the sender used the E-mail address, which includes our domain name. DKIM is the second step in protecting your mail domain against spoofing and phishing attempts. This record probably looks like this: If you're a fully hosted customer, that is, you have no on-premises mail servers that send outbound mail, this is the only SPF TXT record that you need to publish for Office 365. A4: The sender E-mail address, contains information about the domain name (the right part of the E-mail address). Next, see Use DMARC to validate email in Microsoft 365. Go to Create DNS records for Office 365, and then select the link for your DNS host. More info about Internet Explorer and Microsoft Edge, Microsoft Defender for Office 365 plan 1 and plan 2, Set up SPF in Microsoft 365 to help prevent spoofing, Troubleshooting: Best practices for SPF in Microsoft 365, Example: SPF TXT record for multiple outbound on-premises mail servers and Microsoft 365, Use DKIM to validate outbound email sent from your custom domain in Microsoft 365, Use DMARC to validate email in Microsoft 365, Create DNS records at any DNS hosting provider for Microsoft 365. Most of the mail infrastructures will leave this responsibility to us meaning the mail server administrator. This defines the TXT record as an SPF TXT record. Test: ASF adds the corresponding X-header field to the message. Note: Suppose we want to be more accurate, this option is relevant to a scenario in which the SPF record of the particular domain is configured with the possibility of SPF hard fail. You do not need to make any changes immediately, but if you receive the "too many lookups" error, modify your SPF TXT record as described in Set up SPF in Microsoft 365 to help prevent spoofing. For advanced examples, a more detailed discussion about supported SPF syntax, spoofing, troubleshooting, and how Office 365 supports SPF, see How SPF works to prevent spoofing and phishing in Office 365. For instructions, see Gather the information you need to create Office 365 DNS records. Gather the information you need to create Office 365 DNS records, Troubleshooting: Best practices for SPF in Office 365, How SPF works to prevent spoofing and phishing in Office 365, Common. Links to instructions on working with your domain registrar to publish your record to DNS are also provided. (Yahoo, AOL, Netscape), and now even Apple. Add SPF Record As Recommended By Microsoft. Previously, you had to add a different SPF TXT record to your custom domain if you also used SharePoint Online. So only the listed mail servers are allowed to send mail, A domain name that is allowed to send mail on behalf of your domain, Ip address that is allowed sending mail on behalf of your domain, ip4:21.22.23.24 or complete range: ip4:20.30.40.0/19, Indicates what to do with mail that fails, Sending mail for on-premise systems public IP Address 213.14.15.20, Sending mail from MailChimp (newsletters service). Given that we are familiar with the exact structure of our mail infrastructure, and given that we are sure that our SPF record includes the right information about our mail servers IP address, the conclusion is that there is a high chance that the E-mail is indeed spoofed E-mail! Attackers will adapt to use other techniques (for example, compromised accounts or accounts in free email services). Its a good idea to configure DKIM after you have configured SPF. This improved reputation improves the deliverability of your legitimate mail. A typical SPF TXT record for Microsoft 365 has the following syntax: text v=spf1 [<ip4>|<ip6>:<IP address>] [include:<domain name>] <enforcement rule> For example: text v=spf1 ip4:192.168..1 ip4:192.168..2 include:spf.protection.outlook.com -all where: v=spf1 is required. A typical SPF TXT record for Microsoft 365 has the following syntax: v=spf1 is required. Use one of these for each additional mail system: Common. Enabling one or more of the ASF settings is an aggressive approach to spam filtering. This is reserved for testing purposes and is rarely used. IT, Office365, Smart Home, PowerShell and Blogging Tips. today i received mail from my organization. For example, suppose the user at woodgrovebank.com has set up a forwarding rule to send all email to an outlook.com account: The message originally passes the SPF check at woodgrovebank.com but it fails the SPF check at outlook.com because IP #25 isn't in contoso.com's SPF TXT record. One option that is relevant for our subject is the option named SPF record: hard fail. In our scenario, the organization domain name is o365info.com. This applies to outbound mail sent from Microsoft 365. However, there are some cases where you may need to update your SPF TXT record in DNS. A10: To avoid a scenario of false-positive meaning, a scene in which legitimate E-mail will mistakenly identify as a Spoof mail. A great toolbox to verify DNS-related records is MXToolbox. 0 Likes Reply The E-mail address of the sender uses the domain name of a well-known bank. SRS only partially fixes the problem of forwarded email. For example, in case that we need to Impose a strict security policy, we will not be willing to take the risk, and in such scenario, we will block the E-mail message, send the E-mail to quarantine or forward the E-mail to a designated person that will need to examine the E-mail and decide if he wants to release the E-mail or not. Vs. this scenario, in a situation in which the sender E-mail address includes our domain name, and also the result from the SPF sender verification test is fail, this is a very clear sign of the fact that the particular E-mail message has a very high chance to consider as Spoof mail. . Edit Default > advanced optioins > Mark as Spam > SPF record: hard fail: Off. A8: The responsibility of the SPF mechanism is to stamp the E-mail message with the SPF sender verification test results. The obvious assumption is that this is the classic scenario of Spoof mail attack and that the right action will be to block automatically or reject the particular E-mail message. The responsibility of what to do in a particular SPF scenario is our responsibility! For example, contoso.com might want to include all of the IP addresses of the mail servers from contoso.net and contoso.org, which it also owns. Required fields are marked *. If you provided a sample message header, we might be able to tell you more. An SPF TXT record is a DNS record that helps prevent spoofing and phishing by verifying the domain name from which email messages are sent. Depending on the property, ASF detections will either mark the message as Spam or High confidence spam. Messages that use JavaScript or Visual Basic Script Edition in HTML are marked as high confidence spam. Step 2: Set up SPF for your domain. The SPF -all mechanism denotes SPF hardfail (emails that fail SPF will not be delivered) for emails that do not pass SPF check and is the recommended . Once you have formed your SPF TXT record, you need to update the record in DNS. You will also need to watch out for the condition where you SPF record contains more than 10 DNS lookups, and take action to fix it when it happens. by The SPF sender verification can mark a particular E-mail message with a value to SPF = none or SPF = Fail. DKIM email authentication's goal is to prove the contents of the mail haven't been tampered with. The reason for the outcome of SPF = Fail is related to a missing configuration on the sending mail infrastructure., The E-mail address of the sender, uses the domain name of, The result from the SPF sender verification test is , The popular organization users who are being attacked, The various types of Spoofing or Phishing attacks, The E-mail address of the sender includes our domain name (in our specific scenario; the domain name is, The result of the SPF sender verification check is fail (SPF = Fail). It is published as a Domain Name System (DNS) record for that domain in the form of a specially formatted TXT record. In addition to IP addresses, you can also configure your SPF TXT record to include domains as senders. SPF sender verification test fail | External sender identity. Q10: Why our mail server doesnt automatically block incoming E-mail that has the value of SPF = Fail? Gather this information: The SPF TXT record for your custom domain, if one exists. Once a message reaches this limit, depending on the way the receiving server is configured, the sender may get a message that says the message generated "too many lookups" or that the "maximum hop count for the message has been exceeded" (which can happen when the lookups loop and surpass the DNS timeout). Off: The ASF setting is disabled. Use the 90-day Defender for Office 365 trial at the Microsoft 365 Defender portal trials hub. What does SPF email authentication actually do? Sender Policy Framework or SPF decides if a sender is authorized to send emails for any domain. Domain names to use for all third-party domains that you need to include in your SPF TXT record. This is no longer required. A2: The purpose of using the identity of one of our organization users is because, there is a high chance that the Innocent victim (our organization user), will tend to believe someone he knows vs. some sender that he doesnt know (and for this reason tends to trust less). If all of your mail is sent by Microsoft 365, use this in your SPF TXT record: In a hybrid environment, if the IP address of your on-premises Exchange Server is 192.168.0.1, in order to set the SPF enforcement rule to hard fail, form the SPF TXT record as follows: If you have multiple outbound mail servers, include the IP address for each mail server in the SPF TXT record and separate each IP address with a space followed by an "ip4:" statement. Q2: Why does the hostile element use our organizational identity? In case we decide to activate this option, the result is that each of the incoming E-mails accepted by our Office 365 mail server (EOP), and that include SPF sender verification results of SPF = Fail, will automatically be marked as spam mail. This tag allows the embedding of different kinds of documents in an HTML document (for example, sounds, videos, or pictures). In reality, there is always a chance that the E-mail message in which the sender uses our domain name includes and the result from the SPF sender verification test is Fail could be related to some miss configuration issue. In this phase, we will need to decide what is the concrete action that will apply for a specific E-mail message that will identify a Spoof mail (SPF = Fail). If you don't use a custom URL (and the URL used for Office 365 ends in onmicrosoft.com), SPF has already been set up for you in the Office 365 service. In the next two articles (Implementing SPF Fail policy using Exchange Online rule (dealing with Spoof E-mail attack) | Phase 1 learning mode | Part 2#3 and Implementing SPF Fail policy using Exchange Online rule (dealing with Spoof E-mail attack) | Phase 2 production | part 3#3), we will review in details the implementation of SPF fail policy by using an Exchange Online rule. If you have a custom domain or are using on-premises Exchange servers along with Microsoft 365, you need to manually set up DMARC for your outbound mail. Otherwise, use -all. If the sender isn't permitted to do so, that is, if the email fails the SPF check on the receiving server, the spam policy configured on that server determines what to do with the message. Q9: So how can I activate the option to capture events of an E-mail message that have the value of SPF = Fail? It doesn't have the support of Microsoft Outlook and Office 365, though. This conception is half true. Sender Policy Framework, or SPF, is an email authentication technique that helps protect email senders and recipients from spam, phishing and spoofing. is the domain of the third-party email system. The second one reads the "Authentication-Results" line in the header information and if it says "Fail" sends the email to quarantine. In case that your organization experiences a scenario in which your mail server IP address, In the current article and the next article: My E-mail appears as spam | Troubleshooting, In the current article, we will review how to deal with Spoof mail by creating, Your email address will not be published. If you haven't already done so, form your SPF TXT record by using the syntax from the table. For questions and answers about anti-spam protection, see Anti-spam protection FAQ. The setting is located at Exchange admin Center > protection > spam filter > double click Default > advanced options > set SPF record: hard fail: off. This tag allows plug-ins or applications to run in an HTML window. office 365 mail SPF Fail but still delivered Hello today i received mail from my organization. Periodic quarantine notifications from spam and high confidence spam filter verdicts. In this example, the SPF rule instructs the receiving email server to only accept mail from these IP addresses for the domain contoso.com: This SPF rule tells the receiving email server that if a message comes from contoso.com, but not from one of these three IP addresses, the receiving server should apply the enforcement rule to the message. We recommend that you use always this qualifier. This option described as . Oct 26th, 2018 at 10:51 AM. IP address is the IP address that you want to add to the SPF TXT record. Microsoft Office 365. This article describes how you form your SPF TXT record and provides best practices for working with the services in Microsoft 365. Follow us on social media and keep up with our latest Technology news. For questions and answers about anti-malware protection, see Anti-malware protection FAQ. We do not recommend disabling anti-spoofing protection. When the receiving messaging server gets a message from joe@contoso.com, the server looks up the SPF TXT record for contoso.com and finds out whether the message is valid. This is no longer required. To be able to react to the SPF events such as SPF = none (a scenario in which the domain doesnt include a dedicated SPF record) or a scene of SPF = Fail (a scene in which the SPF sender verification test failed), we will need to define a written policy that will include our desirable action + configure our mail infrastructure to use this SPF policy.. After a specific period, which we allocate for examining the information that collected, we can move on to the active phase, in which we execute a specific action in a scenario that the Exchange rule identifies an E-mail message that is probably Spoof mail. Usually, this is the IP address of the outbound mail server for your organization. Also, if you're only using SPF, that is, you aren't using DMARC or DKIM, you should use the -all qualifier. The presence of filtered messages in quarantine. By rewriting the SMTP MAIL FROM, SRS can ensure that the forwarded message passes SPF at the next destination. No. For example, Exchange Online Protection plus another email system. A soft fail would look like this: v=spf1 ip4 192.xx.xx.xx ~all This is the main reason for me writing the current article series. If you have any questions, just drop a comment below. For more information, see Example: SPF TXT record for multiple outbound on-premises mail servers and Microsoft 365. domain name is the domain you want to add as a legitimate sender. This is where we use the learning/inspection mode phase and use it as a radar that helps us to locate anomalies and other infrastructure security issues. This article was written by our team of experienced IT architects, consultants, and engineers. The interesting thing is that in Exchange-based environment, we can use very powerful Exchange server feature named- Exchange rule, for identifying an event in which the SPF sender verification test result is Fail, and define a response respectively. The element that should read this information (the SPF sender verification test result),and do something about it, is the mail server or the mail security gateway that represents the organization mail infrastructure. In the next article, Implementing SPF Fail policy using Exchange Online rule (dealing with Spoof E-mail attack) | Phase 1 learning mode | Part 2#3, we will review the step-by-step instruction needed to create an Exchange Online rule that will help us to monitor such events. Q5: Where is the information about the result from the SPF sender verification test stored? As mentioned, in this phase our primary purpose is to capture Spoof mail attack events (SPF = Fail) and create a log which will be used for analyzing the information thats gathered. The 6 commonly used elements in an SPF record are: You can add as many include: or ip4: elements to your SPF record as you need. For example, vs. the Exchange Online spam filter policy that marks every incoming E-mail message that has the value of SPF = Fail as spam mail without distinction, when using the option of Exchange rule, we can define a more refined version of this scenario, a condition in which only if the sender uses our domain name + the result from the SPF verification test is Fail, only, then the E-mail message will be identified as Spoof mail. This tag is used to create website forms. The E-mail message is a spoofed E-mail message that poses a risk of attacking our organization users. The only thing that we can do is enable other organizations that receive an email message that has our domain name, the ability to verify if the E-mail is a legitimate E-mail message or not. This option enables us to activate an EOP filter, which will mark incoming E-mail message that has the value of SFP =Fail as spam mail (by setting a high SCL value). Now that Enhanced Filtering for Connectors is available, we no longer recommended turning off anti-spoofing protection when your email is routed through another service before EOP. In scenario 1, in which the sender uses the identity of a well-known organization, we can never be sure definitively that the E-mail message is indeed a spoofed E-mail. So before we can create the SPF record we first need to know which systems are sending mail on behalf of your domain, besides Office 365. In each of the above scenarios, the event in which the SPF sender verification test ended with SPF = Fail result is not good. If you have a hybrid deployment (that is, you have some mailboxes on-premises and some hosted in Microsoft 365), or if you're an Exchange Online Protection (EOP) standalone customer (that is, your organization uses EOP to protect your on-premises mailboxes), you should add the outbound IP address for each of your on-premises edge mail servers to the SPF TXT record in DNS. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. One drawback of SPF is that it doesn't work when an email has been forwarded. Office 365 supports only one SPF record (a TXT record that defines SPF) for your domain. This conception is partially correct because of two reasons: Misconception 2: SPF mechanism was built for identifying an event of incoming mail, in which the sender Spoof his identity, and as a response, react to this event and block the specific E-mail message. Messages that contain web bugs are marked as high confidence spam. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Read the article Create DNS records at any DNS hosting provider for Microsoft 365 for detailed information about usage of Sender Policy Framework with your custom domain in Microsoft 365. Yes. Phishing emails Fail SPF but Arrive in Inbox Posted by enyr0py 2019-04-23T19:01:42Z. Best practices and the latest news on Microsoft FastTrack, The employee experience platform to help people thrive at work, Expand your Azure partner-to-partner network, Bringing IT Pros together through In-Person & Virtual events. SPF is the first line of defense in this and is required by Microsoft when you want to use a custom domain instead of the onmicrosoft.com domain. This change should reduce the risk of SharePoint Online notification messages ending up in the Junk Email folder. With a soft fail, this will get tagged as spam or suspicious. The meaning is a hostile element that executes spoofing or Phishing attacks and uses a sender E-mail address that includes our domain name. Feb 06 2023 You can list multiple outbound mail servers. You will first need to identify these systems because if you dont include them in the SPF record, mail sent from those systems will be listed as spam. SPF sender verification check fail | our organization sender identity. Domain administrators publish SPF information in TXT records in DNS. The main reason that I prefer to avoid the option of using the Exchange Online spam filter option is because, this option doesnt distinguish between a scenario in which the sender uses our domain name as part of his E-mail address vs. a scenario in which the sender uses E-mail address, which doesnt include our domain name. Learning/inspection mode | Exchange rule setting. Most end users don't see this mark. Messages sent from Microsoft 365 to a recipient within Microsoft 365 will always pass SPF. Another distinct advantage of using Exchange Online is the part which enables us to select a very specific response (action), that will suit our needs such as Perpend the E-mail message subject, Send warning E-mail, send the Spoof mail to quarantine, generate the incident report and so on. For example, 131.107.2.200. For example, the company MailChimp has set up servers.mcsv.net. To be able to avoid from a false-positive event, meaning an event in which a legitimate E-mail message mistakenly identified as Spoof mail, I prefer more refinement actions such as send the E-mail to approval, send the E-mail to quarantine and so on. However, your risk will be higher. Basically, SPF, along with DKIM, DMARC, and other technologies supported by Office 365, help prevent spoofing and phishing. The reason for our confidence that the particular E-mail message has a very high chance to consider as Spoof mail is because we are the authority who is responsible for managing our mail infrastructure. Microsoft believes that the risk of continuing to allow unauthenticated inbound email is higher than the risk of losing legitimate inbound email. Neutral. For a list of domain names you should include for Microsoft 365, see External DNS records required for SPF. As you can see in the screenshot below, Microsoft has already detected an existing SPF record, marking it invalid.We can safely add include:spf.protection.outlook.com to our SPF record.In your DNS Hosting Provider, look up the SPF record, and click edit. Add include:spf.protection.outlook.com before the -all elementSo in this case it would be:v=spf1 ip4:213.14.15.20 include:servers.mcsv.net include:spf.protection.outlook.com -all. What are the possible options for the SPF test results? An SPF record is required for spoofed e-mail prevention and anti-spam control. You can use nslookup to view your DNS records, including your SPF TXT record. After examining the information collected, and implementing the required adjustment, we can move on to the next phase. A hard fail, for example, is going to look like this: v=spf1 ip4 192.xx.xx.xx -all If mail is being sent from another server that's not the IP in the SPF, the receiving server will discard it. Add a new Record Select Type: TXT Name/Host: @ Content/Value: v=spf1 include:spf.protection.outlook.com -all (or copy paste it from Microsoft 365 ( step 4 )) Click SaveContinue at Step 8, If you already have an SPF record, then you will need to edit it. These scripting languages are used in email messages to cause specific actions to automatically occur. In this scenario, we can choose from a variety of possible reactions.. Best thing to do is report the message via the Junk add-in and open a support case to have it properly investigated. To fix this issue, a sender rewriting scheme is being rolled out in Office 365 that will change the sender email address to use the domain of the tenant whose mailbox is forwarding the message. Ensure that you're familiar with the SPF syntax in the following table. Anti-spoofing protection considers both SPF hard fails and a much wider set of criteria. If you have a hybrid configuration (some mailboxes in the cloud, and . Anti-spam message headers includes the syntax and header fields used by Microsoft 365 for SPF checks. adkim . SPF is added as a TXT record that is used by DNS to identify which mail servers can send mail on behalf of your custom domain. You will need to create an SPF record for each domain or subdomain that you want to send mail from. Note: MailRoute will automatically recognize that you are using Office 365 for your outbound service, so you do not need to enter an outbound mailserver in the MailRoute Control Panel. This is because the receiving server cannot validate that the message comes from an authorized messaging server. When it finds an SPF record, it scans the list of authorized addresses for the record. For example, in an Exchange Online based environment, we can activate an Exchange Online server setting that will mark each E-mail message that didnt pass the SPF verification test (SPF = fail) as spam mail. Messages that contain words from the sensitive word list in the subject or message body are marked as high confidence spam. This defines the TXT record as an SPF TXT record. To get started, see Use DKIM to validate outbound email sent from your custom domain in Microsoft 365. See Report messages and files to Microsoft. We recommend the value -all. I always try to make my reviews, articles and how-to's, unbiased, complete and based on my own expierence. SPF helps validate outbound email sent from your custom domain (is coming from who it says it is). For example, let's say that your custom domain contoso.com uses Office 365. Mark the message with 'soft fail' in the message envelope. Customers on US DC (US1, US2, US3, US4 .
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spf record: hard fail office 365