I suppose that's the main reason for making email be non- mime compliant - the invalidation of the header.
Email header have to be differed from body by new line. Otherwise email clients have no way to know what is body and what is header.
Be sure to leave the blank line after header in case you want comliant email.

In reply to Re: HELP delete blank line in middle of email by sh1tn
in thread remove a blank line after a string by johnajb

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