Place for notes about SMTP
For a full list of what can/can't and shouldn't be used read this page http://www.remote.org/jochen/mail/info/chars.html
Make sure you've read http://kmself.home.netcom.com/Rants/avspam.html
Unless you can do challenge/response authentication, you should make sure your SMTP server supports SSL as outlined above. The easiest authentication to get working with SMTP is PLAIN or LOGIN authentication.
If you relay for other machines, you should set up SSMTP (SMTP over SSL) on Port 465/TCP. This is important in particular for laptops which may be used at a hotel, cybercafe or over wireless where port 25 outgoing may be blocked. MUAs should be configured to use SSMTP where possible.
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