[gentoo-user] how to allow pop,smtp ports on a squid?

[El Nino]

Dear friends,

i'm very new to squid & setuped one for testing purpose, now some users mail accounts are on an outside mail server.so, how can it allow them to send recive mails through my proxy server(pop & smtp)? (how to allow pop & smtp protocols through a squid?)

all advices are welcome.

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2.6.13-gentoo-r4