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External outgoing mails stays stuck in Exchange

Athena4537 over 8 years ago

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 Athena4537 over 8 years ago

Disabling the Email Protection (and enabling DNAT) does not help.

Same situation : incoming OK, outgoing NOK...
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0 Athena4537 over 8 years ago

Very stange...

Sending new mails to external address fails without any trace.

However, replying to a mail works !
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0 sachingurung over 8 years ago

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
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0 Athena4537 over 8 years ago 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 BAlfson over 8 years ago 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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