https://bugs.exim.org/show_bug.cgi?id=1885

--- Comment #21 from Thaddeus H. Black <t...@debian.org> ---
Additional tests seem to confirm my last comment.

In my setup, "smtp.example.com" and "example.com" are the same relay host.  The
DNS A record and reverse DNS say "example.com".  The name "smtp.example.com" is
merely a DNS CNAME alias.

My client is configured to relay through "smtp.example.com", the alias.  When
my client sends several emails within a short period, however, my client
sometimes decides (for some reason) to handle the first email specially. 
Sometimes, my client relays the first email through "example.com".

Why "example.com"?  I do not know.  Maybe because of reverse DNS?

At any rate, I now seem to have a reliable workaround.  I have told the client
to use the same password for "example.com" as for "smtp.example.com".

For information:  as long ago as 2004, a detailed discussion of the issue, or
of a related issue, seems to have taken place at [1].

  [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=244724

Thank you for all the good advice!  I don't know whether you have learned
anything worth learning here, but I have learned much.

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