Complete mail header

Question

I need a set of mail headers to attach to my mail() function in PHP. I send emails with HTML in them, and sometimes services like Yahoo Mail block them. Therefo

Answer 1

The RFCs for both IMF and MIME define the minimal set of headers, so this would be a good place to start.

For IMF, look here: http://tools.ietf.org/html/rfc5322#section-3.6

For MIME, look here: http://tools.ietf.org/html/rfc2045#section-3