[Mailman-Users] Strange Wiki entry for Postfix Tuning

Stefan Förster cite+mailman-users at incertum.net
Tue Aug 4 12:11:04 CEST 2009


I've discovered that the FAQ at http://wiki.list.org/x/rIA9
mentions to set smtp_mx_session_limit=100. While normally, I would
reject such a suggestion as outright wrong, I noticed that this were
comments made by Barry Knowles, and you don't just ignore hints from
someone with that much experience in mailing lists.

So, what is the reason for that setting? From man 5 postconf:

,----[ man 5 postconf | less +/^smtp_mx_session_limit ]
| smtp_mx_session_limit (default: 2)
|     The maximal number of SMTP sessions per delivery request before
|     giving up or delivering to a fall-back relay host, or zero (no
|     limit). This restriction ignores sessions that fail to complete
|     the SMTP initial handshake (Postfix version 2.2 and earlier) or
|     that fail to complete the EHLO and TLS handshake (Postfix version
|     2.3 and later).
|     This feature is available in Postfix 2.1 and later.

While I can certainly imagine larger sites having somewhere between
five to ten MXs, 100 seems a bit... oversized.

Any hints/insights are really appreciated.


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