Hi
In log i get:
Feb 27 15:57:28 smtp1v postfix/cleanup[23476]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:02:28 smtp1v postfix/cleanup[23476]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:02:29 smtp1v postfix/cleanup[23476]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:02:30 smtp1v postfix/cleanup[23476]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:05:28 smtp1v postfix/cleanup[24084]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:05:29 smtp1v postfix/cleanup[24084]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:05:30 smtp1v postfix/cleanup[24084]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:06:28 smtp1v postfix/cleanup[26225]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:11:28 smtp1v postfix/cleanup[26383]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:11:29 smtp1v postfix/cleanup[26383]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:13:28 smtp1v postfix/cleanup[26225]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:13:29 smtp1v postfix/cleanup[26225]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd" Feb 27 16:13:30 smtp1v postfix/cleanup[26395]: warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new lookup error for "us...@domain.ltd"

Problem with connect to database was in ~15:56
some users get thats warrning
some users in this time send normaly - like postfix cached "proxy_map" connections

After restoring the connection to the database, the new connections were correct, but the old ones still received information that it was impossible to connect to the database.
After restart postfix all was ok

Another setup example
It happens the same as in the above case, when, for example, the database cluster transfers VIP IP (keepalived) from one SQL node to another (keepalived move IP)

All new connections work ok, but the old ones get an error connecting to the database.

W dniu 27.02.2024 o 17:44, Wietse Venema via Postfix-users pisze:
natan via Postfix-users:
If i set smtpd_proxy_timeout=60s I "terminating" (timeout) all old
connections who get
"warning: proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_user.cf-new
lookup error foru...@test.lt"
after 60s ?
smtpd_proxy_timeout is a time limit for Postfix to talk to an
smtpd_proxy_filter.

It is NOT a time limit for talking to proxymap server.

As for the lookup error for an existing proxymap connection, the
proxymap client is supposed to retry the query forever, sleeping
one second between attempts.

Your logging examples do not match Postfix code, perhaps you can
provide mor accurate examples. Details matter.

        Wietse
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