What is Nginx default port?

Nginx uses port 80 for HTTP and 443 for HTTPS.

What is MySQL default port?

MySQL uses port 3306 for client connections.

Redis uses port 6379 by default.

SMTP, IMAP, and POP3 mail server components

3 services

postfix systemctl: postfix

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Fast, secure Mail Transfer Agent (MTA). Sends and receives email via SMTP.

apt install postfix postfix-pcre

25tcpSMTP465tcpSMTPS (implicit TLS)587tcpSubmission (STARTTLS)

dovecot systemctl: dovecot

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IMAP and POP3 server for email retrieval. Handles mailbox storage and user authentication.

apt install dovecot-core dovecot-imapd dovecot-pop3d dovecot-lmtpd

143tcpIMAP993tcpIMAPS110tcpPOP3995tcpPOP3S24tcpLMTP

opendkim systemctl: opendkim

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DKIM signing and verification daemon for email authentication.

apt install opendkim opendkim-tools

8891tcpMilter socket (or unix socket)