550 4.4.7 QUEUE.Expired; message expired

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ASKER

On my exchange delivery queue I have this error:
421-4-4-2-connection-dropped

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When I excluded my exchange server from the firewall profile then it works.
Now the emails go through.

But can you explain this behavior ?
Because it happens just to 1 or 2 domains.

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Satya Pathak

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Satya Pathak

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Which firewall are you using then?

ASKER

Fortigate

ASKER

please explain, when I exclude this domain from email-scanning, why it works then ?
And why just some domains are problematic ?

ASKER

again....

ASKER

please explain, when I exclude this domain from email-scanning, why it works then ?
And why just some domains are problematic ?

Since you didn't capture the exact conversation with Wireshark, it could be many reasons. Also you didn't mention if the scanner is on the Exchange (or before), or is behind (transparently or not ?) the Exchange server.
The email scanners log could also reveal more information (depending on which software/UTM and log level available).

ASKER

my exch server is behind the firewall.

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