how to stop using *telnet <domain> 25*

[Wil McGilvery]

Would using smtp with ssl work? Is this the same set up with Qmail that was in a previous tread? If so only allow the sendmail box to connect to the qmail server on port 25. Set up smtp+ssl for all other connections. 

Of course if you know who it is that is using telnet than just block his ip address until you have time to discuss the situation with him. That should get his attention.

Regards,

Wil McGilvery
Manager
Lynch Digital Media Inc

         

416-744-7949
416-716-3964 (cell)
1-866-314-4678
416-744-0406? FAX
www.LynchDigital.com


-----Original Message-----
From: harley7 at mnsi.net [mailto:harley7 at mnsi.net] 
Sent: Saturday, January 24, 2004 3:43 AM
To: linux-users at linux-sxs.org
Subject: Re: how to stop using *telnet <domain> 25*

On Sat, 24 Jan 2004 00:00:20 -0800
Ken Moffat <kmoffat at drizzle.com> wrote:

> Swapana Ghosh wrote:
> 
> >Hi
> >
> >--- Bill Campbell <linux-sxs at celestial.com> wrote:
> >  
> >
> >>On Fri, Jan 23, 2004, Swapana Ghosh wrote:
> >>...
> >>    
> >>
> > 
> > (b) it would prevent your own roaming users
> >  
> >
> >>from sending mail from outside your network.
> >>
> >>    
> >>
> > 
> >Yes that is the main problem. We can't stop any users mails. By the
> >way*telnet* port is closed for all our servers -  that is from our
> >server level, but how to stop others from telnet and using port 25.
> >
> >Thanks again
> >-Swapna
> >
> >
> >  
> >
> 
> 
> Do you know who you want to block?
> How about using /etc/hosts.allow:
> in.telnetd : 192.168.1.100
> in.telnetd : *.example.com
> in.telnetd : ALL : DENY
> 
> I think this would allow only 192.168.1.100 and *.example.com to
> access telnet?
> 
> Or how about blocking the port and using ssh tunnelling? (I'm reading 
> about that...) Access by key only?
> 
> -- 
> Ken

He's not running telnetd. Well... he could be. But in this instance he's
refering to someone using a telnet client to connect to his mail server
to send mail.

Bill
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