I realize this is lacking information normally requested, but before
sending such, was hoping for a bit of a sanity check, without seriously
annoying those more knowledgeable than I.
Have working version of postfix 3.5.9 which acts as a relay for a low
volume in house system, authenticating to an ISP on port 587. This I
will call server A.
The postfix server is configured with "smtp_sasl_type = cyrus" and has
been happily conversing for a year or more, acting as a relay for a
legacy system, I will call server B.
Recently added another (VM) server to run postfix and dovecot. Got that
working, following several write ups and nudges here, with
"smtp_sasl_type = dovecot". This I will call server C.
Mail that is relayed from Server A via Server B is authenticated and
accepted by the ISP as has been the case for a year or so.
Mail that is relayed from Server C via Server B is rejected by the ISP
with the message "Client host rejected: Access denied (in reply to RCPT
TO command)".
Given that Server B authenticates properly in the case of server A, one
might believe it should also authenticate for Server C, since each
specifically "authorized" to relay via Server B. Apparently, that belief
is not well founded.
Thanks for any enlightenment.
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