Hi,
Let me put your question clearly. You have some clients behind the Firewall . Those clients wants to access the SMTP and POP3 .
Just create policy to allow SMTP (25) ,POP3(110) and DNS (UDP 53) {DNS is required if and only if you were configured the SMTP and pop3 using name like smtp.myisp.com
like that)
We just added an alias to DNS liek we use on the internet and directed back to the e-mail server so no "mail.domain.com" resolves both inside and outside the network.
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