Zenovation's Blog » smtp http://zenovations.com/blog A blog about web design, programming, hosting, and virtualmin hacks Mon, 16 Jan 2012 15:01:54 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Changing SMTP Port to 587 (ISP Blocking and SASL) http://zenovations.com/blog/2009/03/changing-smtp-port-to-587-isp-blocking-and-sasl/ http://zenovations.com/blog/2009/03/changing-smtp-port-to-587-isp-blocking-and-sasl/#comments Tue, 31 Mar 2009 07:27:59 +0000 Michael http://zenovations.com/blog/?p=7 I got tired of ISPs blocking outgoing port 25, so I moved our SMTP for clients to port 587. Unfortunately, when migrating our new server, I couldn’t remember how to do this.

After some Googling, I found the answer; add this line in /etc/postfix/master.cf, substituting your port number for 25000:

?View Code BASH
25000 inet n - n - - smtpd -o smtpd_sasl_auth_enable=yes

I left port 25 on too, so users can try either from their ISP. If you want to turn off port 25, just comment out this line:

?View Code BASH
smtp    inet    n       -       n       -       -       smtpd -o smtpd_sasl_auth_enable=yes

Remember to open up the port in your server firewall as well!

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