--- 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 .
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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