open port 25

SMTP is used to send mail. Sendmail, Qmail, Postfix, Exim etc all are used on Linux as mail server. Mail server uses the TCP port 25. Following two iptable rule allows incoming SMTP request on port 25 for server IP address 202.54.1.20 (open port 25): iptables -A INPUT -p tcp -s 0/0 –sport 1024:65535 -d […]

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