I've moved to new hosting provider and automated html email messages don't work anymore - emails are sent automatically by php mail script (contact us form and application form). The form did work with previous hosting provider although I may done something wrong in code?!
Now I've even created new HTML email templates (based on html and css) that I want to use in these automated messages.
I don't know where the problem is? Maybe I have some different settings in mail server, [url removed, login to view] or in php mail code (although my hosting provider claims that everything is fine from their end and they did try to help me as hard as they could)! I can't read emails in Outlook 2007, Thunderbird and Windows Live Mail.... emails should be sent in plain-text and html form, so if webmail/email client blocks html, user could read email in text format.
You basically need to make change in code or server, so that users can read emails in html format (or is worst case in text mode, if email client or webmail provider doesn't support html).