Attachment Mailer class: Send e-mail messages with attachment files

This class can be used to send e-mail messages with attachment files.

The class can send messages with multiple attachment files with automatic MIME type detection using the PHP MIME magic extension.

The class can validate an e-mail address using regular expressions and checking the existence of DNS MX record for the address domain.

The message headers are filtered to prevent abuse of spammers that insert line breaks in the middle or names and addresses that are used in the message.