For complete mail server your ISP should allow following ports:
port 25 - SMTP server - Software Postfix SMTP server
port 110 - POP3 server for outlook - Software dovecot
port 143 - IMAP4 server for outlook - Software dovecot
port 80 - webmail optional - Software HTTPD+squirrelmail+php
If you need secure communication replace
110 with 995 POP3s
143 with 993 IMAPs
Feel free to reply if you need any other info
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Rocky Jr.
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If you have knowledge, let others light their candles at it.
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