[TYPO3] direct_mail plain text doesn't work

[Søren Schaffstein]

Hi there,

I've set up a TYPO3 Version 4.0.0 with the latest direct_mail (2.1.5) 
and TemplaVoila (1.1.0) and can't get plaintext only mails to work. 
Mails are always sent as HTML *AND* PLAIN.
Static plaintext template is included in Typoscript Template.

Any ideas? any help is greatly apprexciated...
Søren


Configuration of dmailer in TSCONFIG:
mod.web_modules.dmail.from_email=newsletter at xxx.de
mod.web_modules.dmail.from_name=xxx Newsletter
mod.web_modules.dmail.organisation=xxx
mod.web_modules.dmail.priority=3
mod.web_modules.dmail.sendOptions=1
mod.web_modules.dmail.includeMedia=0
mod.web_modules.dmail.flowedFormat=0
mod.web_modules.dmail.plainParams=&print=1
mod.web_modules.dmail.use_domain=0
mod.web_modules.dmail.quick_mail_encoding=quoted-printable
mod.web_modules.dmail.direct_mail_encoding=quoted-printable
mod.web_modules.dmail.quick_mail_charset=utf-8
mod.web_modules.dmail.direct_mail_charset=utf-8
mod.web_modules.dmail.use_rdct=1
mod.web_modules.dmail.long_link_mode=1
mod.web_modules.dmail.enable_jump_url=1
mod.web_modules.dmail.test_dmail_group_uids=3