Many php developers utilize email in their code. the only php function that supports this is the mail() function. however, it does not provide any assistance for making use of popular features such as html-based emails and attachments.

class features:
- integrated smtp support - send without a local mail server
- send emails with multiple tos, ccs, bccs and reply-tos
- multipart/alternative emails for mail clients that do not read
html email
- support for utf-8 content and 8bit, base64, binary, and
quoted-printable encodings
- smtp authentication with login, plain, ntlm and cram-md5 mechanisms
over ssl and tls transports
- error messages in 47 languages
- dkim and s/mime signing support