Subject: bug#45586: 27.1; Sometime gnus could be less forgiving of bad RFC 2047 encoded word syntax

From: 積丹尼 Dan Jacobson <[email-masked]>
Date: Fri, 01 Jan 2021 10:43:25 +0800

If only sometimes gnus was stricter, or even warned, when encountering
bad Subject lines, we users could have warned the power company years
earlier, rather than only learning about the problem one day when we
used Gmail instead.

https://stackoverflow.com/questions/65500376/mime-email-subject-etc-headers-vs-utf8-first-split-then-encode

So being over-forgiving has its pluses and minuses.