PHPMailer - A full-featured email creation and transfer class for PHP

Class Features

• Probably the world's most popular code for sending email from PHP!
• Used by many open-source projects: WordPress, Drupal, 1CRM, SugarCRM, Yii, Joomla! and many more
• Integrated SMTP support - send without a local mail server
• Send emails with multiple To, CC, BCC and Reply-to addresses
• Multipart/alternative emails for mail clients that do not read HTML email
• Add attachments, including inline
• Support for UTF-8 content and 8bit, base64, binary, and quoted-printable encodings
• SMTP authentication with LOGIN, PLAIN, CRAM-MD5 and XOAUTH2 mechanisms over SSL and SMTP+STARTTLS transports
• Validates email addresses automatically
• Protect against header injection attacks
• Error messages in 47 languages!
• DKIM and S/MIME signing support
• Compatible with PHP 5.5 and later
• Namespaced to prevent name clashes
• Much more!