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Here is the maillog extract:

May 15 10:20:41 nucleus postfix/smtp[4754]: connect to example.com[192.0.43.10]:25: Connection timed out
May 15 10:20:41 nucleus postfix/smtp[4755]: connect to example.com[192.0.43.10]:25: Connection timed out
May 15 10:20:41 nucleus postfix/smtp[4754]: 3DD566024C: to=<admin@example.com>, relay=none, delay=40615, delays=40585/0.02/30/0, dsn=4.4.1, status=deferred (connect to example.com[192.0.43.10]:25: Connection timed out)
May 15 10:20:41 nucleus postfix/smtp[4755]: 414A66024E: to=<admin@example.com>, relay=none, delay=40615, delays=40585/0.02/30/0, dsn=4.4.1, status=deferred (connect to example.com[192.0.43.10]:25: Connection timed out)

I understand what is happening here and I know how to treat this, I just need to know how I can find out which process is triggering this so that I can clean up the config files for that package.

postconf -d | grep mail_version
mail_version = 2.6.5

Thanks in advance

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Have you tried to read the content of the mail? – squarebear Apr 22 '14 at 12:41

I had these same logs and I noticed these attempts were done right after each unsuccessful email sending from postfix.

When I saw these postfix notification settings I began to think that it has something to do with the default values.

I can't confirm as I didn't check, but I highly suspect it.

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