[TYPO3-english] Powermail and "Premature end of script headers"

[Katja Lampela]

Hi,

With TYPO3 7.3.0 and powermail form on page I get internal server error 
(500) and error log says:

Premature end of script headers: index.php, referer: http://mysite.com/

Otherwise site works ok.

Any idea what might cause this?

-- 
Kind regards,
Katja Lampela
www.lieska.net