qpopper doesn't deal with senders.
The MTA does. Sendmail supports SMTP AUTH.
S/MIME and PGP let you "sign" the contents of messages.
IP is extremely in the wrong layer.
Quoting guenter wessling ([EMAIL PROTECTED]):
> 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])
