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In order to protect against these, once you have set up SPF, you should also configure DKIM and DMARC for Microsoft 365. Outlook.com might then mark the message as spam. In simple words, the destination recipient is not aware of a scenario in which the SPF result is Fail, and they are not aware of the fact that the E-mail message could be a spoofed E-mail. 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. 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. What are the possible options for the SPF test results? Messages that hard fail a conditional Sender ID check are marked as spam. Even in a scenario in which the mail infrastructure of the other side support SPF, in case that the SPF verification test marked as Fail, we cannot be sure that the spoofed E-mail will be blocked. Based on your mentioned description about "SPF authentication fails for our outbound emails sent by Exchange Online despite having this DNS record : v=spf1 include:spf.protection.outlook.com -all", once could you please provide us your detailed error message screenshot, your SPF record and domain via private message? Do nothing, that is, don't mark the message envelope. 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In the current article, we will review how to deal with Spoof mail by creating, Your email address will not be published. Join the movement and receive our weekly Tech related newsletter. by For more information, see Advanced Spam Filter (ASF) settings in EOP. Summary: This article describes how Microsoft 365 uses the Sender Policy Framework (SPF) TXT record in DNS to ensure that destination email systems trust messages sent from your custom domain. Although there are other syntax options that are not mentioned here, these are the most commonly used options. Login at admin.microsoft.com Navigate to your domain - Expand Settings and select Domains - Select your custom Domain (not the <companyname>.onmicrosoft.com domain Lookup the SPF Record Click on the DNS Records tab. Otherwise, use -all. The reason could be a problem with the SPF record syntax, a specific mail flow, such as E-mail forwarding that leads to this result, and so on. This will avoid the rejections taking place by some email servers with strict settings for their SPF checks. This is the default value, and we recommend that you don't change it. This article describes how to update a Domain Name Service (DNS) record so that you can use Sender Policy Framework (SPF) email authentication with your custom domain in Office 365. If you set up mail when you set up Microsoft 365, you already created an SPF TXT record that identifies the Microsoft messaging servers as a legitimate source of mail for your domain. We do not recommend disabling anti-spoofing protection. LazyAdmin.nl also participates in affiliate programs with Microsoft, Flexoffers, CJ, and other sites. To do this, change include:spf.protection.outlook.com to include:spf.protection.outlook.de. SPF record types were deprecated by the Internet Engineering Task Force (IETF) in 2014. We don't recommend that you use this qualifier in your live deployment. 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.. SPF works best when the path from sender to receiver is direct, for example: When woodgrovebank.com receives the message, if IP address #1 is in the SPF TXT record for contoso.com, the message passes the SPF check and is authenticated. Domain names to use for all third-party domains that you need to include in your SPF TXT record. If an SPF TXT record exists, instead of adding a new record, you need to update the existing record. Nearly all large email services implement traditional SPF, DKIM, and DMARC checks. A great toolbox to verify DNS-related records is MXToolbox. I always try to make my reviews, articles and how-to's, unbiased, complete and based on my own expierence. In this phase, we are only capturing event in which the E-mail address of the sender uses the domain name of our organization, and also; the result from the SPF sender verification test is Fail. If you have a hybrid configuration (some mailboxes in the cloud, and some mailboxes on premises) or if you're an Exchange Online Protection standalone customer, add the outbound IP address of . An SPF record is required for spoofed e-mail prevention and anti-spam control. Identify a possible miss configuration of our mail infrastructure. Disable SPF Check On Office 365. Anti-spam message headers includes the syntax and header fields used by Microsoft 365 for SPF checks. 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. Figure out what enforcement rule you want to use for your SPF TXT record. How Does An SPF Record Prevent Spoofing In Office 365? I hate spam to, so you can unsubscribe at any time. Depending on the property, ASF detections will either mark the message as Spam or High confidence spam. The condition part will activate the Exchange rule when the combination of the following two events will occur: In phase 1 (the learning mode), we will execute the following sequence of actions: This phase is implemented after we are familiar with the different scenarios of Spoof mail attacks. Generate and Send an incident report to a designated recipient (shared mailbox) that will include information about the characters of the event + the original E-mail message. The following examples show how SPF works in different situations. A typical SPF TXT record for Microsoft 365 has the following syntax: v=spf1 is required. The second one reads the "Authentication-Results" line in the header information and if it says "Fail" sends the email to quarantine. Customers on US DC (US1, US2, US3, US4 . Ensure that you're familiar with the SPF syntax in the following table. Destination email systems verify that messages originate from authorized outbound email servers. The most important purpose of the learning/inspection mode phase is to help us to locate cracks and grooves in our mail infrastructure. If you have a hybrid configuration (some mailboxes in the cloud, and some mailboxes on premises) or if you're an Exchange Online Protection standalone customer, add the outbound IP address of . Also, if you're using DMARC with p=quarantine or p=reject, then you can use ~all. Best thing to do is report the message via the Junk add-in and open a support case to have it properly investigated. The meaning is a hostile element that executes spoofing or Phishing attacks and uses a sender E-mail address that includes our domain name. The defense action that we will choose to implement in our particular scenario is a process in which E-mail message that identified as Spoof mail, will not be sent to the original destination recipient.. Previously, you had to add a different SPF TXT record to your custom domain if you also used SharePoint Online. This tool checks your complete SPF record is valid. SPF sender verification test fail | External sender identity. Microsoft maintains a dynamic but non-editable list of words that are associated with potentially offensive messages. SPF identifies which mail servers are allowed to send mail on your behalf. Q5: Where is the information about the result from the SPF sender verification test stored? Included in those records is the Office 365 SPF Record. Microsoft suggests that the SPF of Spambrella gets added to the domain's SPF. The SPF mechanism doesnt perform and concrete action by himself. For example, let's say that your custom domain contoso.com uses Office 365. Fix Your SPF Errors Now SPF Check Path The path for the check is as follows Exchange Admin Center > Protection > Spam Filter > Double Click Default > Advanced Options > Set SPF record: Hard fail: Off One of the prime reasons why Office 365 produces a validation error is an invalid SPF record. We can say that the SPF mechanism is neutral to the results his main responsibility is to execute the SPF sender verification test and to add the results to the E-mail message header. . Some services have other, more strict checks, but few go as far as EOP to block unauthenticated email and treat them as spoofed messages. Received-SPF: Fail ( protection.outlook.com: domain of ourdomain1.com does not designate X .X.X.X as permitted sender) We have SPF for our domain v=spf1 include:spf.protection.outlook.com -all We have also enable that fail SPF email should not get in our admin centre. Continue at Step 7 if you already have an SPF record. 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. v=spf1 ip4:10.10.10.1/16 mx ptr:Sender.domain.com include:spf.protection.outlook.com ~all. It is published as a Domain Name System (DNS) record for that domain in the form of a specially formatted TXT record. 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. Notify me of followup comments via e-mail. The rest of this article uses the term SPF TXT record for clarity. The -all rule is recommended. In our scenario, the organization domain name is o365info.com. Per Microsoft. When this mechanism is evaluated, any IP address will cause SPF to return a fail result. Messages sent from an IP address that isn't specified in the SPF Sender Policy Framework (SPF) record in DNS for the source email domain are marked as high confidence spam. adkim . 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. The element which needs to be responsible for capturing event in which the SPF sender verification test considered as Fail is our mail server or the mail security gateway that we use. And as usual, the answer is not as straightforward as we think. By analyzing the information thats collected, we can achieve the following objectives: 1. 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. By looking at your SPF TXT record and following the chain of include statements and redirects, you can determine how many DNS lookups the record requires. 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. Learning about the characters of Spoof mail attack. 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). Messages with no subject, no content in the message body, and no attachments are marked as high confidence spam. Find out more about the Microsoft MVP Award Program. An SPF record is used to identify which mail servers (or systems) are allowed to send mail on your behalf. A10: To avoid a scenario of false-positive meaning, a scene in which legitimate E-mail will mistakenly identify as a Spoof mail. In reality, we can never be sure in 100%, that the E-mail message is indeed spoofed E-mail message or, a legitimate E-mail message. 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 can be one of several values. Office 365 supports only one SPF record (a TXT record that defines SPF) for your domain. 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. Did you know you can try the features in Microsoft 365 Defender for Office 365 Plan 2 for free? Instruct the Exchange Online what to do regarding different SPF events.. Most of the mail infrastructures will leave this responsibility to us meaning the mail server administrator. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. My opinion that blocking or rejecting such E-mail messages is too risky because, we cannot enforce other organizations to use SPF, although using SPF is recommended and help to protect the identity and the reputation of a particular domain. 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. We . Test: ASF adds the corresponding X-header field to the message. All SPF TXT records end with this value. After examining the information collected, and implementing the required adjustment, we can move on to the next phase. In order to use a custom domain, Office 365 requires that you add a Sender Policy Framework (SPF) TXT record to your DNS record to help prevent spoofing. This is no longer required. This applies to outbound mail sent from Microsoft 365. A3: To improve the ability of our mail infrastructure, to recognize the event in which there is a high chance, that the sender spoofs his identity or a scenario in which we cannot verify the sender identity.The other purpose of the SPF is to protect our domain mane reputation by enabling another organization to verify the identity of an E-mail message that was sent by our legitimate users. It is true that Office 365 based environment support SPF but its imperative to emphasize that Office 365 (Exchange Online and EOP) is not configured anything automatically! You then define a different SPF TXT record for the subdomain that includes the bulk email. One option that is relevant for our subject is the option named SPF record: hard fail. SPF identifies which mail servers are allowed to send mail on your behalf. Misconception 3: In Office 365 and Exchange Online based environment the SPF protection mechanism is automatically activated. If you're not sure that you have the complete list of IP addresses, then you should use the ~all (soft fail) qualifier. Learning/inspection mode | Exchange rule setting. When you have created a new Office 365 tenant and your subscription includes Exchange Online or Teams, then you will need to add a couple of DNS records. Enforcement rule is usually one of the following: Indicates hard fail. Also, if your custom domain does not have an SPF TXT record, some receiving servers may reject the message outright. Usually, this is the IP address of the outbound mail server for your organization. In each of these scenarios, if the SPF sender verification test value is Fail the E-mail will mark as spam. We are going to start with looking up the DNS records that Microsoft 365 is expecting and then add the correct SPF record to our DNS hosting provider: First, we are going to check the expected SPF record in the Microsoft 365 Admin center. 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). 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. We recommend that you use always this qualifier. In the current article series, our primary focus will be how to implement an SPF policy for incoming mail, by using the option of Exchange rule, and not by using the Exchange Online spam filter policy option. Your support helps running this website and I genuinely appreciate it. In many scenarios, the spoofed E-mail message will not be blocked even if the SPF value marked as Fail because of the tendency to avoid a possible event of false positives. For detailed information about other syntax options, see SPF TXT record syntax for Office 365. Take a look at the basic syntax for an SPF rule: For example, let's say the following SPF rule exists for contoso.com: v=spf1 . 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. Not all phishing is spoofing, and not all spoofed messages will be missed. This option described as . Failing SPF will not cause Office 365 to drop a message, at best it will mark it as Junk, but even that wont happen in all scenarios. For questions and answers about anti-malware protection, see Anti-malware protection FAQ. See Report messages and files to Microsoft. In case we want to get more information about the event or in case we need to deliver the E-mail message to the destination recipient, we will have the option. Update your SPF TXT record if you are hitting the 10 lookup limit and receiving errors that say things like, "exceeded the lookup limit" and "too many hops". These tags are used in email messages to format the page for displaying text or graphics. The event in which the SPF sender verification test result is Fail, can be realized in two main scenarios. ip4: ip6: include:. Indicates neutral. Setting up DMARC for your custom domain includes these steps: Step 1: Identify valid sources of mail for your domain. 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. This type of scenario, there is a high chance that we are experiencing a Spoof mail attack! If you have anti-spoofing enabled and the SPF record: hard fail ( MarkAsSpamSpfRecordHardFail) turned on, you will probably get more false positives. Implement the SPF Fail policy using a two-phase procedure the learning/inspection phase and the production phase. Scenario 2 the sender uses an E-mail address that includes. This article provides frequently asked questions and answers about anti-spoofing protection for Microsoft 365 organizations with mailboxes in Exchange Online, or standalone Exchange Online Protection (EOP) organizations without Exchange Online mailboxes. Make sure that you include all mail systems in your SPF record, otherwise, mail sent from these systems will be listed as spam messages. In these examples, contoso.com is the sender and woodgrovebank.com is the receiver. The E-mail is a legitimate E-mail message. In Office 365 based environment (Exchange Online and EOP) beside the option of using Exchange rule, we can use an additional option the spam filter policy. If you know all of the authorized IP addresses for your domain, list them in the SPF TXT record, and use the -all (hard fail) qualifier. 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. Feb 06 2023 In each of the above scenarios, the event in which the SPF sender verification test ended with SPF = Fail result is not good. Legitimate newsletters might use web bugs, although many consider this an invasion of privacy. 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. For example, we are reasonable for configuring SPF record that will represent our domain and includes the information about all the mail server (the Hostname or the IP address) that can send E-mail on behalf of our domain name. An SPF record is a DNS entry containing the IP addresses of an organization's official email servers and domains that can send emails on behalf of your business. 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).