My newsletters always arrive in Outlook Express (on different platforms and different machines) as plain text. Yahoo and other web-mail clients work fine, though. My admin settings are as follows and should be correct:

E-Mail Transport Method - PHP
E-Mail Linefeeds - LF
Use MIME HTML When Sending Emails - true
Send E-Mails - true
Email Admin Format? - HTML

I also tried changing e-mail sending method as well as stripping the code of all <body> and <html> tags (as suggested elsewhere on this noble forum) to no avail. BTW, I'd really like to keep the <head> tags for encodings (my NL is in Russian), but at this ponit this seems like a minor nuisance compared to the inability to use HTML at all.

Any remedies?