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10.4: Fix firewall blocking of Mail under internet sharing
Authored by: ThreeBKK on Oct 02, '08 10:01:59PM

liz4cps: Thanks for posting that hint.

Maybe some updated information would be useful for Mac users in 2008.

I'm sharing internet from Tiger (PPC) to Leopard (Intel). I could receive, but couldn't send Mail messages after opening TCP and UDP ports 993. After adding 587 to TCP, I was able to send, and I found that closing UDP port 993 had no negative effect.

Apparently, port 143 is used for non-SSL Mail, which I don't plan to use anyway.

To summarize:
TCP 587, 993
UDP (nothing)
Personal Web Sharing (enabled)

This works for me, and I'm syncing a MobileMe account, and a Gmail account, both of which are IMAP.

Also of interest: While sharing internet from Leopard (PPC) to Leopard (Intel), Mail "just works". There is no need to open and close individual ports to attain full functionality.

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