Useful commands for email service running on CentOS

service command - list running services


service --status-all

List service and their open ports


netstat -tulpn

For example:

service dovecot is using port: 110 and 143

service exim is using port: 25

SMTP is specified for outgoing mail transport and uses TCP port 25

 port 110: the port used for receiving email

Port 143: using imap protocol to retrieve eMai

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