Re: [exim] Exim problem with non-TLS supporting senders

On 10/8/12, Wolfgang Breyha <wbreyha@???> wrote:
> A good start. Write the dump to disk and analyze it with ngrep and/or
> tcpdump
> afterwards. Should at least show the clear text commands and if STARTTLS is
> involved.

It seems that in the time since I pointed out the problem to the user,
the sender's admin appeared to have fixed the issue yesterday. The
solutions appears to be correcting rDNS since that was the only
externally visible change I can tell.

Originally the sender server would fail rDNS checks with a SMTP banner
mismatch but now it resolves correctly. I didn't think that was a
serious issue and assumed the log would had indicated it was dropped
due to some filter/blacklist rule against mismatch rDNS rather than
the ambiguous entry.