[Jawelin]

Thanks a lot, FireFly.
I read that article but I fear the problem isn't the php.ini setup.
I'm on a Linux (shared) server and the ini settings are always the same.
Only, my provider changed the SMTP server.
I still use the sendmail -t instruction but the problem - I guess - is in the header of the single email itself.

As said before, my problem is: sending via mail() function extactly the same built as before, now I receive a badly-formatted text-only email with all the html stuff.
Is there any other mime type I could put into the header ?

Thanks for the answer.
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