OSX ML firewall is blocking smtp/imap connection to the server. how can i enable it without turning off the firewall?

With the firewall turned on and with the "block all incoming connections" option untick, I can send email to internal and external addressee. However,
1. Mail clients both from LAN and from outside (WAN connected) could not connect to the mail server. Both SMTP and IMAP could not connect to the server.
2. External MTA (say from google or yahoo MX server) could not connect to the server too.
both of these issues are resolved if I set the firewall to OFF. Is there a workaround without turning this off? appreciate your input/advise..

I've used Mail on Exchange and Gmail with the firewall on for send/recieve on my Mac no problem there.
However,  are you asking about the MacServer? If so, you're in the wrong section...
Remember how public-facing systems work, they have to be universally accessible directly or through a DMZ zone in the firewall/gateway. This means the firewall/gateway has to be upstream from the server, not directly on the server.
Also, check your DNS settings on the computers and server both inside and outside the network.

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