Negative SMTP response to data-dot and Blocked MTA-BLOCKED

[Mark Martinec]

Daniel,

> Please help me to understand what are the various reasons for this error.
> 
> In our infrastructure, only few mails get stuck in deferred Q and it
> remains in the Q even after 2/3 days.

> We have postfix node in which we configured amavisdfeed (in main.cf)
> as content_filter=amavisfeed:[127.0.0.1]:10024
> the amavisd version we use is  amavisd-new-2.6.4 (20090625)

> $notify_method  = 'smtp:[127.0.0.1]:10025';
> $forward_method = 'smtp:[127.0.0.1]:10030';
> 
> Jul  5 22:22:27 myHostMachine amavis[24264]: (24264-18)
>   Negative SMTP response to data-dot (<mydestination at mydomain.com>):
> Jul  5 22:22:27 myHostMachine amavis[24264]: (24264-18)
>   (!)FWD via SMTP: <myclient at mydomain.com> -> <mydestination at mydomain.com>,BODY=7BIT
>   451 4.5.0 No resp. to data-dot, id=24264-18, from MTA([127.0.0.1]:10030):

> Yes, we have a custom program that listen to 10030 which consume the messages. 

Looks like you custom program on port 10030 is not responding
(or not responding in time) after being fed a message and a
terminating dot.

If you have such messages stuck in a queue (so this problem
is repeatable at will by a 'postfix flush'), then either enable
debugging in your custom program, or capture a TCP traffic
(tcpdump -i lo0 -s 0 -w 0.log 'tcp port 10030') and examine
what happened in an SMTP session with wireshark.

  Mark