Problem receiving external POP3 mail in clients

[acon]

I have a Zentyal server acting as the gateway for my network. I does not use the proxy module and i have the mail server with zarafa configured and running.
I have some users that need to get POP3 mail from a different domain in an external server.
In mail server module configuration i have disabled pop3 and imap services (i use zarafa webmail).
In firewall, in internal networks, i have a rule to allow pop3 trafic (port 110).
When the internal clients try to get POP3 fron external servers, they get some times time out, some times the mail is received as an attachement in a message from zentyal server, detected as spam.
So i think there is a "transparent pop3 proxy", filtering all pop3 trafic even if it is not destinated to mail server.
¿Is there any way to allow pop3 trafic to flow througt the server without the " transparent proxy"?

[jsalamero]

Disable mailfilter module, it does transparent POP3 proxy.

[acon]

What else does mailfilter module?
If it does not affect the zentyal mail server, i will disable it

Thaks

[acon]

Mailfilter Module does POP3 and SMTP proxy filtering.
If i disable module, does mail server smtp trafix still cheched for viruses etc...?

Thanks

[Javier Amor Garcia]

You could disable only POP3 transparent proxy in the section Mail Filter -> POP Transparent Proxy . Uncheck the 'enabled' setting