Firewall and ports to leave open
I did some search around but didn't find a "comprehensive" list of which port should be left open in a standard installation of CPanel used ONLY as a mail server/webmail.
So to have WHM/CPanel/Webmail access, SMTP/POP3/IMAP (with SSL and not) and eventually ports for updates like SpamAssassin update, CPanel update, BIND for caching Blocklists, whatever other update is there.
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The docs should be helpful: Which ports should be open if my cPanel server is behind a firewall? - cPanel Documentation 0
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