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Helpful answers
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Dec 12, 2015 3:44 PM in response to Tattwamby MrHoffman,TCP 587 is the ESMTP submission port that Apple Mail.app and most other mail clients use, via STARTTLS.
Getting TCP 465 to work will require manual configuration in Postfix.
The file you'll be editing via the command line is /Library/Server/Mail/Config/postfix/master.cf
Search for 465 there, and read the comments from the folks at Apple.
To make the changes...
sudo serveradmin stop mail
edit the file and save it, and then...
sudo serveradmin start mail
Related: StackOverflow, Krypted
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Dec 28, 2015 2:51 AM in response to Tattwamby FromOZ,Tattwam wrote:
Following ports are currently open :
143
If you have a certificate and port 993 (Secure IMAP) working you should close, not use, port 143 insecure IMAP. There are no benefits and your passwords may go out in plain text.
Tattwam wrote:
We want to use 465 port instead of 25.
Why? Assuming you want to use it for client email submission (not incoming email from Internet to your server) and you have port 587 functioning there is no need or benefit.