On Thu, Feb 09, 2012 at 11:43:54AM +0200, Nerijus Kislauskas wrote:
> > Lost connection after data may mean either the client closed the
> > connection, or the mail was timed out.
> > Are you able to send mails to this postfix server from other machines ?
> > If yes then it is unlikely to be a smtpd server issue
>
> No, you ar not right my friend.
>
> "Lost connection after DATA" does not mean "client closed connection".
Yes it can, though more typically, the data transfer fails below the
application layer.
The connection was lost. It could have been explicitly closed, but
more likely it experienced a TCP retransmission timeout due to path
MTU issues, firewall bugs, or similar. To resolve the issue, the OP
needs to run "tcpdump" as documented in:
http://www.postfix.org/DEBUG_README.html#sniffer
--
Viktor.
