On Sat, Jan 22, 2022 at 08:01:27AM +1100, raf wrote:
> > It is an issue with email that postfix has received, via fetchmail, and is
> > attempting to deliver to another system. Authentication is being
> > attempted, without it being required or requested, at least as far as I can
> > tell.
>
> That doesn't sound right. Add that remote server to debug_peer_list
> to increase the debugging when sending mail to it.
There's no need. The OP reported use of sender dependent
authentication, which causes any mail *from* some recipients
to expect to need to authenticate to the nexthop server.
If the messages in question are not in fact routed to a nexthop that
requires authentication, then sender dependent authentication should
not be enabled for these users.
IIRC Wietse already suggested a work-around, by making the
sender-dependent authentication settings be transport-specific.
In particular the internal nexthop that does not do SASL should be
handled by a transport in which sender-dependent authentication is
disabled.
--
Viktor.
