Re: while sending end of data

[Wietse Venema]

maciejm:
> Nov 13 14:31:24 mail postfix/smtp[13077]: 4CXcYV334tz20nTW:
> to=<u...@domain.pl>, relay=127.0.0.1[127.0.0.1]:10628, delay=5295,
> delays=5044/0/0/250, dsn=4.4.2, status=deferred (lost connection with
> 127.0.0.1[127.0.0.1] while sending end of data -- message may be sent
> more than once)

You changed the smtp_data_done_timeout (default 600s)
to a too small value.

        Wietse