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→Test the SMTP port remotely
== Edit/Modify /etc/mail/sendmail.cf ==
* Backup the file first: cp /etc/mail/sendmail.cf /etc/mail/sendmail.cf.lux
* Add the following line in the option section(use your IP for the Addr=):
0 DaemonPortOptions=Port=smtp,Addr=10.0.117.10, Name=MTA
after the line:
0 DaemonPortOptions=Port=smtp,Addr=127.0.0.1, Name=MTA
* Restart sendmail:
service sendmail restart
* Run the command "netstat -ant" you should have the following two lines:
Proto Recv-Q Send-Q Local Address Foreign Address Stat
...
tcp 0 0 10.0.117.10:25 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
...
== Open SMTP port on the firewall ==
Run the following command:
/sbin/iptables -I INPUT -p tcp --dport 25 -j ACCEPT
Note that you can make the rule more restrictive by specifying the Source Network or IP address.
== Test the SMTP port locally ==
telnet localhost 25
== Test the SMTP port remotely ==
Login to another VMs and run the following command to connect to port 25 on 10.0.117.10
telnet 10.0.117.10 25
== Sendmail with ldap ==
http://icmp.ru/man/servers/ldap/sendmail-ldap.html