Mail Header

[Alesya]

Guys could ya tell me please, what should the mail header look like when we want to send a letter in a multipart/alternative format? How to write a header correctly? Also what is the BOUNDARY and how to form it? Please advise.

[alehambre]

What format are you trying to send in, and what are you ultimately trying to accomplish?

[Alesya]

It's HTML Newsletter. There're texts, pics, and links in it.