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Request Port 25 Access SMTP

Denis Michaud 0 Reputation points
2025-09-02T15:53:06.7966667+00:00

We need to have access to port 25 for our Virtual Machine as we need to perform with the actual SMTP server of our client that is configured only for port 25

Azure Virtual Network
Azure Virtual Network

An Azure networking service that is used to provision private networks and optionally to connect to on-premises datacenters.

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  1. Andreas Baumgarten 132.1K Reputation points MVP Volunteer Moderator
    2025-09-02T16:01:52.5166667+00:00

    Hi @Denis Michaud ,

    please take a look here: Troubleshoot outbound SMTP connectivity problems in Azure

    You will find the information the communication using Port 25 is blocked.

    For some types of Azure Subscriptions it's possible to get this limitation removed: Enterprise and MCA-E

    Another option is to use an authenticated SMTP relay on TCP Port 587 -> Recommended method of sending email

    (If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

    Regards

    Andreas Baumgarten

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