Hard to explain in the subject what I need, so, I will try to explain what I
have and what I need

We have 4 MX that have all the anti-spam filters, theoretically, all mails
to our clients arrives to our MXs and then the MX send the mail to the
appropriate server
Every server has his own smtp server to allow clients to connect using POP
Before SMTP or SMTP-AUTH to send mail or to sent mail from web pages using

This is the desire escenario, but we have a lot of direct connections to the
IP of the server hosting the domain bypassing the MXs servers

Is there a way to allow only connection (on port 25) from user with POP
before SMTP, from localhost and from our MXs and block the direct
connections ?

Thanks in advance
Pablo Murillo

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