Action mailer 'Content-Type' found without required MIME hea

In my application i use the actionmailer.
When i send a message to myself my spamfilter noticed the following

MIME_HEADER_CTYPE_ONLY ‘Content-Type’ found without required MIME
MIME_HTML_NO_CHARSET RAW: Message text in HTML without charset

Is there a way to fix this?

Thanks in advance

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