Email does not route correctly ( Remote / Local domains ).MX records are incorrect ( pointing to the wrong server ).The email address was typed incorrectly.Mail file permissions are not readable or are incorrect.There are several reasons why you would get a “ 550 No Such User Here” error. This error occurs when the sending email is rejected because the username cannot be found or is not accessible by the server. Use this issue type: Technical > Virtual Network > Cannot send email (SMTP/Port 25).One common error you can get when sending email is the “ 550 No Such User here” error. If you are using an Enterprise Agreement subscription and still need help, contact support to get your problem resolved quickly. If you change your subscription type from Enterprise Agreement to another type of subscription, changes to your deployments may result in outbound SMTP being blocked. If you're using a non-enterprise subscription type, we encourage you to use an authenticated SMTP relay service, as outlined earlier in this article. This is to ensure better security for Microsoft partners and customers, protect Microsoft’s Azure platform, and conform to industry standards. The Azure platform will block outbound SMTP connections on TCP port 25 for deployed VMs. The exemption applies only to the subscription requested and only to VM traffic that is routed directly to the internet. This will exempt the qualified enterprise dev/test subscriptions automatically.Īfter the subscription is exempted from this block and the VMs are stopped and restarted, all VMs in that subscription are exempted going forward.
To request to have the block removed, go to the Cannot send email (SMTP-Port 25) section of the Diagnose and Solve blade in the Azure Virtual Network resource in the Azure portal and run the diagnostic. It is possible to have this block removed.
These problems are not covered by Azure support.įor Enterprise Dev/Test subscriptions, port 25 is blocked by default. If your emails are rejected or filtered by the external domains, you should contact the email service providers of the external domains to resolve the problems. However, there is no guarantee that external domains will accept the incoming emails from the VMs. Enterprise Agreementįor VMs that are deployed in standard Enterprise Agreement subscriptions, the outbound SMTP connections on TCP port 25 will not be blocked. Using these email delivery services isn't restricted in Azure, regardless of the subscription type. You might also have an authenticated SMTP relay service on your on-premises servers. SendGrid is one such SMTP relay service, but there are others. (These relay services typically connect through TCP port 587, but they support other ports.) These services are used to maintain IP and domain reputation to minimize the possibility that external domains reject your messages or put them to the SPAM folder.
We recommend you use authenticated SMTP relay services to send email from Azure VMs or from Azure App Service. Sending email on Port 25 is unsupported for all other Azure Platform-as-a-Service (PaaS) resources.
However, the subscription limitations described below still apply. It is possible to use port 25 for outbound communication on Azure App Service and Azure Functions through the virtual network integration feature or when using App Service Environment v3. For all examples below, the process applies mainly to Virtual Machines & VM Scale Sets resources ( Microsoft.Compute/virtualMachines & Microsoft.Compute/virtualMachineScaleSets).
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