Does Azure Block Port 587. I thought about using port 587, however I do Yes, Hetzner or any ot

I thought about using port 587, however I do Yes, Hetzner or any other VPS provider such as Akamai, Azure, etc does not block inbound port 25 or port 587 and I can receive email so long as I have a public IPV4 address. If it is still isn't working, you need to look at Port 587 is designated for secure mail submissions to an email server. Port 25 Blocking: Azure blocks outbound SMTP traffic on port 25 for subscriptions that are not part of the Enterprise Agreement (EA) or Microsoft Customer Agreement for Now that Azure supports the BYOIP option, does it mean that a client is allowed to generate outbound SMTP connection (port 25) from a machine using their custom ip resources? We have a Dockerized Laravel app up on Azure which is working fine apart from emails (Office365 smtp on port 587). I told them the spiel about the port being blocked and we have to use a different Thanks for the response. We have two App Servicesone for development and one for If unblocking port 25 is not feasible, consider configuring Postfix to use alternative ports that are commonly allowed for email transmission, such as port 587 (sending) or 465 . Today, however, SMTP should use port 465 for secure SMTP over TLS. For all other subscription types, the Azure So, when using a other than standard-enterprise subscription , users are recommended to use an authenticated SMTP relay service to send email from Azure VMs In this guide, you will learn the precise steps to open ports in a Microsoft Azure VM, including configuring Network Security Groups Instead of relying on port 25, Microsoft recommends using authenticated SMTP submission ports such as 587 or 465 with TLS, or leveraging Azure Communication Services FWIW, Azure does not block arbitrary ports - if you open them in the endpoint and in your firewall on the VM, that traffic will get to you. To request to have the block removed, go to the Cannot send email (SMTP-Port 25) section The only way to do this appropriate is to authenticate into a working mail service and leverage them. Azure’s restrictions on outbound port SMTP Port 587: A Guide to Checking and Troubleshooting SMTP port 587 helps with email Tagged with smtpport587, If you are running Barracuda Email Security Gateway on Microsoft Azure, Microsoft imposes certain restrictions and limitations. These services are used in part to maintain IP reputation that is critical for To request to have the block removed, go to the Cannot send email (SMTP-Port 25) section of the Diagnose and Solve section in the So, for the sake of security, Microsoft Azure by default closes almost all ports; that’s why we will learn how to open certain ports there. 4K • Volunteer Moderator 5 Aug 2025, 13:11 Hi Hans, TCP port 587 and 465 should not be blocked by Azure by default. It is possible to have this block removed. Instead of sending mail To set up a connection from an Azure server to SendGrid, you will need to open the following ports in the Network Security Group (NSG) For those who are struggling with setting up Authenticated SMTP (SMTP AUTH over 587/TCP) on multifunctionals or webforms (that don't support modern For Enterprise Dev/Test subscriptions, port 25 is blocked by default. Recommended Method of Sending E-mail Microsoft recommends that Azure customers employ authenticated SMTP relay This is intentional to prevent spam and abuse. I do this as a relay in Azure answering on port 25, but it sends email out port 587 with Using custom port instead of smtp 25 for hybrid Hello, I want to block port 25 completely in on-prem Exchange server ,so can I use port 587 for smtp communication AFAIK, azure websites does not block port 25 or 587 (SendGrid works on those with no issue). Thanks for the response. At this time, Microsoft does not allow Check out this article to learn how to check if SMTP port 587 is open and how to troubleshoot blockages and ensure continuous TP 146. The problem though is that I need to be able to send SMTP traffic from outside Azure over to my VM. Follow these steps: Create a . These services are used in part to maintain IP reputation that is critical for By containerizing your worker service, you can open and expose any port you need, including port 587 for SMTP. Unlike the more traditional message submission ports, port Connections to authenticated SMTP relay services are typically on TCP port 587 and isn't blocked. For VMs that are deployed in standard Enterprise Agreement subscriptions, the outbound SMTP connections on TCP port 25 will not be blocked. Although SMTP port 25 remains a foundational protocol for email, its open nature presents significant security risks in cloud environments. To request to have the block removed, go to the Cannot send We are moving out of a local data centre to azure. We have setup exchange 2019 in azure but during testing found port 25 blocked which is used for the office 365 connectors. These services are used in Connections to authenticated SMTP relay services are typically on TCP port 587 and isn't blocked. Have you tried testing to see if you can connect to Originally, the Simple Mail Transfer Protocol (SMTP) used port 25. They are on a CSP subscription and wanting to move some scheduled tasks that send emails to Azure. NET Worker Service using Connections to authenticated SMTP relay services are typically on TCP port 587 and isn't blocked. Unfortunately, Azure will not unblock port 25 for these types of subscriptions, even upon request. I thought about using port 587, however I do It's possible to have this block removed. I would however have to think that your configuration is not correct, an SMTP As mentioned, port 25 is blocked from being able to be used; this is due to the potential of botting/spamming etc, from Cloud resources. For Enterprise Dev/Test subscriptions, port 25 is blocked by default. Research Review Azure Firewall known issues and limitations to help you plan, deploy, and troubleshoot your firewall effectively.

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