The SMTP Relay Restrictions Form is used to prevent users and/or systems from relaying mail through Post.Office. Normally a complicated configuration, Post.Office is pre-configured to prevent relaying while allowing your remote users to send their E-mail.
Preventing mail relay can be a very important issue if your mail server is not behind a firewall or is otherwise left exposed to the great wide Internet. Not only could your server resources be exploited, but many servers may no longer accept mail from you if you are identified as an "Open Relay".
Again, Post.Office is pre-configured with settings to keep your server secure (passing all ORBS/ordb.org tests) and maintain accessibility by your remote users.
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