SMTP server drops some messages w\attachments

I have 2003 server (no spack) running IIS SMTP at our gateway. I am
experiencing problems with a particular domain. When they send us email with
attachments the smtp server usually doesnt complete the transaction. If the
message has no attachment it usually completes the transaction and passes the
message onto my internal group server. I believe they are using Exchange but
cannot verify as yet. Any ideas on what to look for in this odd behaviour?
Appreciate responses.

Limit on message size?

"Tim Fitch" wrote:

> I have 2003 server (no spack) running IIS SMTP at our gateway. I am
> experiencing problems with a particular domain. When they send us email with
> attachments the smtp server usually doesnt complete the transaction. If the
> message has no attachment it usually completes the transaction and passes the
> message onto my internal group server. I believe they are using Exchange but
> cannot verify as yet. Any ideas on what to look for in this odd behaviour?
> Appreciate responses.
>

No. No limits on sizes. Possibley has to do with the firewall stripping
ESMTP responses. KB article talks about the issue.

"NunoCosta" wrote:

> Limit on message size?
>
> "Tim Fitch" wrote:
>
> > I have 2003 server (no spack) running IIS SMTP at our gateway. I am
> > experiencing problems with a particular domain. When they send us email with
> > attachments the smtp server usually doesnt complete the transaction. If the
> > message has no attachment it usually completes the transaction and passes the
> > message onto my internal group server. I believe they are using Exchange but
> > cannot verify as yet. Any ideas on what to look for in this odd behaviour?
> > Appreciate responses.
> >