Postfix: Configure a SmartHost with SMTP Authentication and TLS

A smart host is a type of mail relay server which allows an SMTP server to route e-mail to an intermediate mail server rather than directly to the recipient’s server. [Wikipedia]

This document aims to describe some simple steps to setup a Postfix eMail server with a SmartHost used to relay messages through. The SmartHost will be authenticated and secured trough TLS.

1. Create a password file in /etc/postfix/relay_password containing SMTP host, username and password (used for submission authentication) as shown:

Fix SSL 2.0 on IIS

In IIS 7 (and 7.5), there are two things to do:

  1. Navigate to: Start > 'gpedit.msc' > Computer Configuration > Admin Templates > Network > SSL Configuration Settings > SSL Cipher Suite Order (in right pane, double click to open). There, copy and paste the following (entries are separated by a single comma, make sure there's no line wrapping):

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