From: Peter Rabbitson (rabbitrabbit.us)
Date: Tue May 01 2007 - 09:52:56 CDT

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Hi,

I am experiencing 421 errors between my secondary and primary MXes, and
it seems it is cause by lack of connection caching.
http://www.postfix.org/postconf.5.html#smtp_connection_cache_on_demand
misses to explain what is "high volume of mail in the active queue".
When is exactly connection caching activated?

Thanks

Peter

P.S. I know that I can permanently enable connection caching on the
secondary MX when talking to the primary but I am trying to keep the
configuration concise.

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