qmgr failed to connect to smtp service

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poly

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Jun 10, 2022, 2:43:13 AM6/10/22
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postfix version 3.2.5
there are 38 mails in the active queue
the following logs are repeated every five hours
qmgr: timeout connecting to transport: smtp
qmgr: exit status 1

command mailq stucks, and log: fatal: malformed showq server response
there is a smtp process stucking for very long time
there are a lot of cleanup processes stucking for very long time

it seems the master process doesnot fork new smtp processes to deliver mails in the active queue.

thanks


poly

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Jun 14, 2022, 3:39:56 AM6/14/22
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before the above happened, postfix logs warning: unix_trigger_event: read timeout for service public/qmgr twice.
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