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Sendmail to Use Additional Ports
Configure sendmail.mc to allow an additional SMTP port.
vi /etc/mail/sendmail.mc
#---
DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
DAEMON_OPTIONS(`Port=26, Name=MTA')dnl
#---
Compile the sendmail.cf file and restart Sendmail services.
m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
service sendmail restart
If you run the iptables firewall, open the necessary hole.
vi /etc/sysconfig/iptables
#---
-A [name] -m state --state NEW -m tcp -p tcp --dport 26 -j ACCEPT
#---
service iptables restart
You are now able to use an additional port for SMTP services.
- Scotech
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