Could not open a socket to the SMTP server

==== Required information ====
- iRedMail version: 0.8.5
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Debian Wheezy
- Related log if you're reporting an issue: N/A
====

Hi there, I'm trying to setup SMTP with my IPB forum however whenever I try to send an email from the forum such as a newsletter i get the error: "Could not open a socket to the SMTP server"

Anyone know why this would be happening? Or how to fix it?

Regards, JJEdgar