"Stephen F. Bosch" wrote:
> Dale Miracle wrote:
> > Sounds like they maybe blocking that on their network. If that is the
> > case there is nothing that can be done.
>
> Okay - this sounds plausible...
>
> Just tried it - she can't make simple SMTP connections to ANY other mail
> servers... sounds like you are right.
>
> What about assigning this user a special SMTP port? Can I do this with
> qmail? Run an additional SMTP service at a custom port number? That
> would bypass such a block.
Yes but to do that would need a port forwarding package. On a linux box
you would use the ipchains type firewalling program. On a *bsd box you
would use IPNAT/IPFILTER since I don't anything about the linux
alternative I can only speak about *bsd systems. NAT is network address
translation. You can have an address from the world come in on a
certain port and be redirected to another port on your box. So lets say
you want port 1090 (for example) you would in simple terms tell the NAT
(which part of IPFILTER 'the firewall portion') program that any request
for port 1090 is to be directed to port 25 . This is completely
possible and viable. Other examples of why you would want to do this is
enhanced security. You can run your web server etc on a non broadcast
numbers like 192.168.x.x on a standard port but configure NAT/IPF with
the internet broadcast address and port. An incoming connection from
the world would come in on 206.x.x.x port 80 and would be redirected to
192.168.x.x port 80 or whatever port or ip you use.
I hope this explains this a little.
--
Dale Miracle
System Administrator
Teoi Virtual Web Hosting
