On the NETTUTS.com site, a new tutorial has been posted about implementing a system to validate new members/signups for your site via their email.
NETTUTS.com: How to Implement Email Verification for New Members
Sending Email with PHP
W. Jason Gilmore has written an article about different ways of sending email with PHP. His article discusses the native mailer function, the PEAR Mail package, and the Zend_Mail component under a Zend Framework approach.
How to Create Clicable, but Obfuscated mailto: Links on Your Site
A recently launched onPHP5.com site has published a tutorial on how to create working mailto: links in a way that spam bots would not be able to collect them. Click on inside for details.
Mail Call!
p. Everybody needs to send mail from their application at one point or another. It’s like using a database or a sledge-hammer, sooner or later, you are going to want to do it. But what’s the best tool? Yesterday I got an email from a “friend of mine”:http://www.sqlyog.com asking me this question. Since I respect him and his team and they didn’t know the answer, I figure there might be others out there who struggle with this.

