[Dovecot] Ip addr + login name

[mike]

Hi everybody,

Is there a way to bind client ip address that connects to pop3 with
the login name? For example if the client ip address is 192.168.2.40
then his login name is 'test' and he can log in with only that account
name.
I think it is possible to do it with an external authentication
program.

Thanks.