From: dogbert (dogberttiscali.it)
Date: Fri Dec 02 2005 - 09:39:57 CST

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Wietse Venema wrote:
> dogbert:
>>>> If the problem is the total absence of "<CR><LF>.<CR><LF>" how can I resolve it
>>>> ? I don't like the solution "Don't use postfix". I'd like to understand if this
>>>> problem is a common issue also with mail server from internet or if it's limited
>>>> to a few servers.
>>> SMTP mail must end in "<CR><LF>.<CR><LF>".
>>>
>>> If it does not, all SMTP servers will have problems, not just Postfix.
>>>
>> Actually the first mail relay is working in my infrastructure and it's not
>> giving me a lot of problems. Maybe oll of my mail servers accept a less strictly
>> implementation of SMTP while Postfix stick to the RFC (it's not a bad thing).
>
> SMTP mail must end in <CR><LF>.<CR><LF>.
>
> If you disagree, then I challenge you to provide the evidence in
> the form of a tcpdump recording.
>
> So far you have not provided a tcpdump recording that shows mail
> going through without <CR><LF>.<CR><LF> at the end, where the SMTP
> server recognizes the end of the message.
>

I don't want to fight for this problem. ;-)
I'm in accord with you that every mail transaction MUST end with a
"<CR><LF>.<CR><LF>" string.
As you have analyzed in your other message it seems that there is a problem at
TCP Kernel level.

Now I'm trying to understand why the linux box lost that packet.

Thank for you help.

Riccardo

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