From: Ralf Hildebrandt on
* Thomas POINDESSOUS <poindessous537(a)foncia.fr>:
>
> Hi,
>
>
> I have a problem between one of my postfix and a zimbra server (postfix server).
>
>
> sometime (one mail every three days), I got this error :
> 502 5.5.2 Error: command not recognized (in reply to RCPT TO command)
>
>
> I did a tcpdump to understand why I got this error and I found that one of the "RCPT TO:" command is cut in two packets.
> First packet finished by "RC" and second packet began by "PT TO:". And the server doesn't understand this command.

Is there a firewall between the two?

--
Ralf Hildebrandt
Geschäftsbereich IT | Abteilung Netzwerk
Charité - Universitätsmedizin Berlin
Campus Benjamin Franklin
Hindenburgdamm 30 | D-12203 Berlin
Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
ralf.hildebrandt(a)charite.de | http://www.charite.de


From: Ralf Hildebrandt on
* poindessous537(a)foncia.fr <poindessous537(a)foncia.fr>:
> Yes, I think this is a cisco asa 5550, with a special filter which protects "smtp server".
>
> Do you think I should ask to disable it ?

Yes. It causes nothing but grief :)

--
Ralf Hildebrandt
Geschäftsbereich IT | Abteilung Netzwerk
Charité - Universitätsmedizin Berlin
Campus Benjamin Franklin
Hindenburgdamm 30 | D-12203 Berlin
Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
ralf.hildebrandt(a)charite.de | http://www.charite.de


From: Victor Duchovni on
On Fri, Jul 09, 2010 at 03:58:12PM +0200, poindessous537(a)foncia.fr wrote:

> ... a special filter which protects "smtp server".
>
> Do you think I should ask to disable it ?

Yes, always. The SMTP inspection feature notoriously does more harm than good.

--
Viktor.