Mutt mistakenly displays part of message header as body if a header field contains a newline
I've received an email with an interesting header that contains a newline in its value. Mutt treats text following this newline as message body, while Thunderbird correctly recognized the header and displayed only the actual body.
RFC 822 states that the header part is terminated by two contiguous CRLFs, but in this case it's not contiguous, so I think it's a bug in Mutt.
Example header:
X-MS: MS
z
Mutt version: Mutt 1.14.4 (2020-06-18)
Edited by Zero King