From: Ralph Utbult (no email)
Date: Wed Dec 01 2004 - 09:53:27 EST
> Ämne: Re: Problem with attachment in Outlook and Express
>
> On Wed, Dec 01, 2004 at 02:18:43PM +0100, Ralph Utbult wrote:
>
> > Hi,
> >
> > I'm running ML 10.0 with Postfix, Spamassassin & Mailman.
> Clients run
> > Windows 2k with Outlook Express or Outlook. Ordinary mail
> is ok, but
> > hook up an attachment and the client will never finish
> sending. Any idea?
> >
>
> The most common source of size dependent behaviour is PMTU
> discovery failure. Make sure that any firewall between your
> Outlook users and the server allow (and if necessary NAT)
> ICMP unreachable responses.
There is no firewall between the server and the clients. They all sit behind one, though.
> Send a large text message with no attachments and see if size
> rather than MIME structure is the primary issue. Also
> consider disabling SMTP inspection in any firewalls, they
> often get it wrong, Postfix is robust enough to not require any help.
This is interesting! It seems that when mail is bigger than 10 kB, OE takes a very long time to send it.
I see a lot of 354 End data with <CR><LF> in the log file.
> Show the server logs for aborted messages, and if provide a
> full (complete packets with -s 1500), raw (the binary file
> with -w file, not the decoded packets) tcpdump capture file
> of a single session.
>
> A useful trick is:
>
> tcpdump -r filein -w fileout tcp port 12345 or icmp host 1.2.3.4
>
> to pick a particular session (with host 1.2.3.4 connecting
> with source port 12345) out of a multi-session capture.
> Generate the original capture via:
>
> tcpdump -i interface -w filein tcp port 25 or icmp
I don't quite follow here (remember, I'm a newbie at this...). What is the 'filein' name? Where do I find it?
Regards,
Ralph
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