(sorry, deleted the original post, so the advice below may not apply)
Have you tried telneting to port 25 on the target server, sending a HELO,
and then doing a VRFY user @
etc ... ? Try this from inside the
firewall, and from outside, and see if you get the same response (and
also find out if you get "no such user" even from inside).
On Sat, 20 Dec 1997, Chris Brenton wrote:
> Takacs Istvan wrote:
> > We have about 140 users who use the MS Exchange 5.0 Server
> > and in some cases the firewall sends that error message below,
> > backward to the sender to the external network.
> Sooooo, what kind of firewall?
> > What does this message means?
> > > szrtfw2.szerencsejatek.hu unable to deliver mail to the following
> > >recipient(s):
> > > istvan .
> > > istvan.takacs:
> > > No such user
> I would guess it means "no such user" ;)
> Are you running a proxy of filtering? I would guess a proxy that keeps a table
> of all e-mail address mappings. The user needs to be added to this list in
> order to receive mail. This can usually be done by have the user send a
> message to someone on the Internet. Most proxies will create the mapping
> > I checked if the users didn't set up properly, but they have
> > the same profiles as the others.
> Um, since it is the firewall generating the error message, did you check the
> config on the firewall as well?
> cbrenton @
> Multiprotocol Network Design & Troubleshooting
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