> Apr 11 16:26:40 <hostname (internal)> postfix/smtp[1325]:
> 488851744F: to=<freebsd-multimedia-requ...@freebsd.org>,
> relay=mx1.freebsd.org[69.147.83.52]:25, delay=100211,
> delays=100114/49/48/0.35, dsn=4.7.1, status=deferred (host
> mx1.freebsd.org[69.147.83.52] said: 450 4.7.1 Client host rejected:
> cannot find your hostname, [<my-IP>] (in reply to RCPT TO command))

It seems like it is a DNS problem.

Are you sure that:

- your mail server gateway name resolves into your mail server gateway IP

and

- your mail server gateway IP reverse resolves to your mail server gateway name

Both should be resolve properly.

The check should be done outside of your own subnet, from an Internet
Cafe (use Windows nslookup command, same syntax as nslookup on Unix)
from home if you use a different ISP than for the machine that makes
problem...

You mention that you recently changed your IP, how recent is that
recently? The old IP/name could be cached at FreeBSD.

Bests,

Olivier
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