Try using Javascript to check the email, that way the email address can be
checked on the client machine, rather than on the server. A quick google for
"javascript email validation" should produce the results. Not sure about
good websites but if you are prepared to go to paper books then Sams Teach
Yourself Apache, PHP and MySQL is very good and has a chapter covering stuff
like email with PHP. It also includes full copies of Apache, PHP and MYSQL
so you can set them up and test them on your own machine.
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