xinetd : refused connect form 200.100.200.100

Hello,

got a problem with mail

i have a e-smith mail server with ip-adress 200.200.200.50 and no internet access it is for local mail only / and i want to receive mail from our other company (through a leased line cisco router).

They have a ip-range 200.100.200.xxx , we can ping to my e-smith server, we can also send mail to it , but when we want to receive it with pop3, then we get this message in the /var/log/messages or /var/log/maillog

xinetd refused connect from 200.100.200.109

that is a machine on the other company.

Thanks for your time,
Ronald Tanis