Many ISP(Internet Service Provider) are blocking 25 port which is used to send emails from email clients like The Bat, Outlook, Thunderbird .etc, so what you must do if you want to use some email client, this is very simple, login as root, go to your postfix directory by default this is ” etc/postfix ” you must edit ” master.cf ” you can use this command ” vi master.cf “, click ” i ” and add this

2525      inet  n       -       n       -       -       smtpd

which will open 2525 port, save changes and exit ” :wq “, now you can use 2525 port to send emails.

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