[Mailman-Users] Messages delivered out of order and delayed

Jim Ziobro list at ziobro.rochester.ny.us
Sat Sep 14 00:30:31 EDT 2019

Indeed email is not a synchronous messaging channel.  But most email 
clients will sort incoming messages by header Date thus undo the effects 
of out-of-order delivery.

  Even if you send out two messages in a row to joe at gmail.com there is 
no guarantee that both messages go to the same machine. The two 
receiving machines may have different loads and may not even be running 
the same software.

Almost all email MTAs send out smaller messages first.  In general that 
is a good thing.  It virtually guarantees out of order delivery for a 
rapid discussion.

The wild random delay is not unique to Mailman.  I had a Yahoo Group 
with a couple hundred addresses.  Some messages went in seconds but 
every once in a while messages took days to get delivered sometimes to a 
subset of the members.  This happened even to @yahoo.com recipients!



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