Question

How do i uninstall Postfix. Will Fail2Ban still be able to email me?

I setup mailgun to forward my emails to gmail. I use gmail aliases to send emails from my domains. Mailgun.com is a free alternative to using google apps.

1.) How do i uninstall postfix? 2.) Will fail2ban still be able to email me if i do uninstall postfix? 3.) Can i remove pop3 110, 995 ports from firewall? 4.) Can i remove imap ports 83, 587 from firewall? 5.) Can i remove SMTP port 25 from firewall? I have a ubuntu 14.04 LEMP server.

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Kamal Nasser • October 8, 2015

Hi,

1.) How do i uninstall postfix?

You can uninstall Postfix by running:

sudo apt-get remove postfix

2.) Will fail2ban still be able to email me if i do uninstall postfix?

By default, no. fail2ban needs a Mail Transfer Agent such as Postfix in order to send emails.

However, you can disable email notifications and set up a script that sends email alerts through Mailgun whenever a host is banned or unbanned:

3.) Can i remove pop3 110, 995 ports from firewall? 4.) Can i remove imap ports 83, 587 from firewall? 5.) Can i remove SMTP port 25 from firewall?

Once you’ve uninstalled Postfix, yes, you can safely remove them. To make sure that they are not used anymore, run the following command which lists all open/active ports along with the processes that are bound to them:

sudo netstat -plutn