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Old 2nd November 2011, 11:15
till till is offline
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You mean you sent a email from gmail to your server and it did not arrive? If port 25 is closed, you can not recieve emails from the internet as every external server will try to connect to your server on port 25. The submission port is only used as workarount to connect with a smtp client like thunderbird to your server directly and not for receiving external emails.

To run a full mail server that receives mails directly from the internet, you need port 25 to be open from the internet to your server.
Till Brehm
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