Defect #38513
closed
Incorrect case of MIME-Version email header field name
0%
Description
Hi
Registration confirmation email triggers the following rspamd symbol:
Symbol: MV_CASE(0.50)
code for this check is:
rspamd_config.MV_CASE = {
callback = function (task)
return task:has_header('Mime-Version', true)
end,
description = 'Mime-Version .vs. MIME-Version',
score = 0.5,
group = 'headers'
}
i.e. (at least AFAIU) it checks whether the exact (i.e. case-sensitive) header name given is 'Mime-Version'.
https://datatracker.ietf.org/doc/html/rfc1521#section-3 states
Messages composed in accordance with this document MUST include such a header field, with the following verbatim text: MIME-Version: 1.0
i.e. the case of 'MIME' needs to be all uppercase.
Related issues
Updated by Pavel Rosický over 2 years ago
this has been fixed by https://github.com/mikel/mail/pull/1503 but it isn't released in any version yet. Anyway, it's something that should be discussed there rather than here.
Updated by Go MAEDA 22 days ago
- Blocked by Patch #43472: Update Mail gem to 2.9 added
Updated by Go MAEDA 22 days ago
Pavel Rosický wrote in #note-1:
this has been fixed by https://github.com/mikel/mail/pull/1503 but it isn't released in any version yet. Anyway, it's something that should be discussed there rather than here.
Mail gem 2.9.0 that includes this fix has been released on October 22, 2025.