PHPMailer

PHP's built-in mail() lacks SMTP auth, makes attachments painful and often lands in spam. PHPMailer is the classic email sending library for PHP, sending HTML mail with attachments over SMTP in a few lines.

It supports TLS, XOAUTH2 and localized error messages, used by countless PHP projects.

Features

SMTP:With authentication.

HTML and attachments:Easy.

Security:TLS and XOAUTH2.