Alex Bederov writes:
Thanks for the hints, Sam, but I cannot see what's wrong yet.
It looks like Authstart is there:
ls -al ~courier/libexec/courier/modules/esmtp/
total 992
drwxr-xr-x 2 courier courier 4096 Jan 2 22:16 .
drwxr-xr-x 6 bin bin 4096 Jan 2 22:16 ..
-r-xr-x--- 1 courier courier 27139 Jan 2 22:16 addcr
-r-xr-xr-x 1 courier courier 54422 Jan 2 22:16 authend
-r-sr-x--- 1 root courier 128327 Jan 2 22:16 authstart
-r-xr-x--- 1 courier courier 544812 Jan 2 22:16 courieresmtp
-r-xr-x--- 1 courier courier 223159 Jan 2 22:16 courieresmtpd
AUTH is advertized as an ESMTP extension if ESMTPAUTH is initialized. Find
the couriertcpd process that has port 25 open, and look in /proc to see what
in its environment.