Константин Волков added the comment:

But message ID have its own syntax https://www.ietf.org/rfc/rfc2822.txt:

3.6.4. Identification fields

message-id      =       "Message-ID:" msg-id CRLF
msg-id          =       [CFWS] "<" id-left "@" id-right ">" [CFWS]

3.2.3. Folding white space and comments

However, where CFWS occurs in this standard, it MUST NOT be inserted
   in such a way that any line of a folded header field is made up
   entirely of WSP characters and nothing else.

Its not obvious, but it seems that there must be no CRLF symbol before 


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