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When all Postfix SMTP server (smtpd) processes are busy, connections from remote SMTP clients will queue in the kernel up to some kernel defined limit.
If this is a persistent condition, remote SMTP clients will give up waiting before a Postfix SMTP server (smtpd) process becomes available, and Postfix SMTP server (smtpd) processes will log "lost connection after CONNECT" errors.
The Postfix cure is:
smtpd_recipient_restrictions = reject_unlisted_recipient permit_mynetworks reject_unauth_destination ...
© by Ralf Hildebrandt
This document contains links to external information sources that I do neither monitor nor control. I explicitly disclaim any liabilities in respect to external references.
You are getting this document without any guarantees. Any methods shown above are meant as demonstration and may be wrong in some place. You may damage your system if you try to follow my hints and instructions. You do this at your own risk!
This file was last modified 08. Jun 2009 by root