I believe that TCP wrappers can do it provided the sessions are not using
encryption. 

If I remember correctly the syntax is user@IPaddress or user@reverseDNS

popper: [EMAIL PROTECTED] 

Personally, I prefer to use SSH based on DSA keys then use port
forwarding.  I put the users in a menu where the only option is quit.  I
allow popper from 127.0.0.1 only.  Openssh has a free sshd.  Teraterm has
a free ssh client, but it only suppports version 1.

James


 On Mon, 18 Jun 2001, Randall Gellens wrote:

> At 5:35 PM +0200 6/14/01, guenter wessling wrote:
> 
> >  Hi, all.
> >  My users have static IP�s.
> >  Is there a way in qpopper 403 to determine whether the sender is authentic ?
> >  I.e.: check the IP ?
> >  SSL is great in the first place, but IP check would be sort of "small
> >  digital signature".
> >
> >  guenter
> >  guenter wessling ([EMAIL PROTECTED])
> 
> You want Qpopper to check during authentication that the user name 
> entered matches the IP address being used?
> 
> Qpopper doesn't currently do this, but you could patch it or create 
> a PAM module to do it.
> 

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