Inbound TCP Ports
20 - FTP
21 - FTP
22 - SSH
25 - SMTP
26 - SMTP
53 - DNS
80 - HTTP
110 - POP3
143 - IMAP4
443 - HTTPS
465 - SMTP (TLS/SSL)
993 - IMAP4 (SSL)
995 - POP3 (SSL)
2082 - cPanel
2083 - cPanel(SSL)
2086 - WHM (Web Host Manager)
2087 - WHM (SSL)
2095 - Webmail
2096 - Webmail (SSL)
3306 - MYSQL (if you want to allow remote access to databases)
Inbound UDP Ports
21 - FTP
53 - DNS
465 - SMTP (TLS/SSL)
Outbound TCP Ports
20 - FTP
21 - FTP
25 - SMTP
26 - SMTP
37 - RDATE
43 - WHOIS
53 - DNS
80 - HTTP
113 - IDNET
465 - SMTP (TLS/SSL)
873 - rSync
2089 - cPanel Licensing
3306 - MySQL (if you want to allow remote access to databases)
Outbound UDP Ports
21 - FTP
53 - DNS
465 -SMTP (TLS/SSL)
873 – rSync
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