How to change default SMTP 25 port in postfix on CentOs?
Check and open master.cf
vi /etc/postfix/master.cf
-------------------------------------------------------------------
#Comment default line as below.
#smtp inet n - n - - smtpd
#Add new line with port as you like as below.
9485 inet n - n - - smtpd
-------------------------------------------------------------------
Then you need to restart postfix service.
/etc/init.d/postfix restart
And configue you SMTP as
Hostname Port no Username Password
SMTP.domain.com 9485 abc passwd
Thats it.!
Check and open master.cf
vi /etc/postfix/master.cf
-------------------------------------------------------------------
#Comment default line as below.
#smtp inet n - n - - smtpd
#Add new line with port as you like as below.
9485 inet n - n - - smtpd
-------------------------------------------------------------------
Then you need to restart postfix service.
/etc/init.d/postfix restart
And configue you SMTP as
Hostname Port no Username Password
SMTP.domain.com 9485 abc passwd
Thats it.!
