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I do not agree here (but I'm not an expert).

First - the documentation says:
"""The email package attempts to be as RFC-compliant as
possible, supporting in addition to RFC 2822, such
MIME-related RFCs as RFC 2045, RFC 2046, RFC 2047, and RFC 2231.
"""

But, as I can see, the generated email does not conform to
RFC 2822.

Second - I use email package as a "filter".
read raw email text, do some processing, generate raw email
text.

Really, I don't understand why generated headers don't are
separed by '\r\n' and one must rely on an external tool for
the right conversion.

Thanks.