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Переодически стал наблюдать такие сообщения
Oct 16 18:23:26 mail postfix/smtpd[28342]: fatal: watchdog timeout
Oct 16 18:23:27 mail postfix/master[28306]: warning: process /usr/lib/postfix/cleanup pid 28343 exit status 1
Oct 16 18:23:27 mail postfix/master[28306]: warning: process /usr/lib/postfix/smtpd pid 28342 exit status 1

Почему эти сообщения возникают?