TetraWiki - User contributions [en]

Restrict IP address for SMTP service in firewall

2019-11-06T12:04:50Z

Sakshi: Created page with "'''Concern''' :- Request from Jakson.com to restrict some IP address for mail sending.''' We have blocked the IP address with the following command on firewall to drop the ..."

'''Concern''' :- Request from Jakson.com to restrict some IP address for mail sending.'''

We have blocked the IP address with the following command on firewall to drop the SMTP connections.

'''firewall-cmd --permanent --add-rich-rule="rule family='ipv4' source address='192.168.16.14' service name=smtp reject"'''

Smart Relay Host Port in Sendmail

2019-10-28T08:59:08Z

Sakshi:

'''''There is an alternative to relay email using a different port at their mail server and their mail server supports SMTP authentication. You may follow the simple Sendmail setup below: –'''''

1. Find “DS” in /etc/mail/sendmail.cf and add your mail server name as below: –

'''DSmail.example.com'''

2. Find “Mrelay” in /etc/mail/sendmail.cf and add “2525” to “A=TCP $h” as below: –

'''A=TCP $h 2525'''

3. Add the following line below in /etc/mail/access file in one line: –

'''AuthInfo:mail.example.com "U:user@example.com" "I:user@example.com" "P:password" "R:example.com" "M:LOGIN PLAIN"'''

4. Then, restart your Sendmail service as below: –

'''service sendmail restart'''

5. Finally, you can monitor your maillog using the command below: –

'''tail -f /var/log/maillog'''

'''Reference''' [http://wingloon.com/2008/04/06/setup-smart-relay-host-port-in-sendmail/] http://wingloon.com/2008/04/06/setup-smart-relay-host-port-in-sendmail/

Smart Relay Host Port in Sendmail

2019-10-28T08:58:15Z

Sakshi: Created page with "'''''There is an alternative to relay email using a different port at their mail server and their mail server supports SMTP authentication. You may follow the simple Sendmail ..."