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External outgoing mails stays stuck in Exchange

Athena4537

Hello,

I recently configure my forst UTM, and everyting was working fine 2 days ago (including outgoing mails).

However, since yesterday morning, all external outgoing mails stay stuck in the Exchange server.

And I cannot sse any teace of them in the UTM logs (including Email Protection).

How can I see what is blocking them, and how can I solve this ?

Remark : when I connect my old firewall, the mails are immediately released => it is not an Exchange issue.

Thanks in advance for your help.



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  • 0

    Hi Bernard,

    Did you check mail manager logs? You can find this option in Email Protection> Mail Manager. What logs do you discover here, when an outgoing mail is stuck?

    Which SMTP port is in use? Take a TCPDUMP on the specific SMTP port through UTM and verify if the communication is proper.

    Thanks

    Sachin Gurung
    Team Lead | Sophos Technical Support
    Knowledge Base  |  @SophosSupport  |  Video tutorials
    Remember to like a post.  If a post (on a question thread) solves your question use the 'This helped me' link.

  • 0 in reply to sachingurung

    Hi Sachin,

    Thanks for the answer.

    However, after staying a whole night working on the issue, I discovered the problem.

    It was... the multipath !

    I had to create a multipath rule to redirected all SMTP flow on the Fixed IP Internet access.

    Now, it works fine.

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  • 0 in reply to Athena4537

    Is Exchange configured to use the UTM as a smart host?  Compare your configuration to Basic Exchange setup with SMTP Proxy.  To use only the interface with a fixed IP for sending mail, use a Traffic Selector of 'Any -> SMTP -> Internet' in your Multipath rule and uncheck 'Skip rule ...' in the 'Advanced' section of the rule.

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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