Florian Sager:
> According to the mails below the RFC compliant change of content
> encoding in MTA-forwarding may break signatures that follow the RFC 4871
> recommendation to include header "Content-Transfer-Encoding" in the
> signature. This header should be removed from section 5.5. Recommended
> Signature Content (The following header fields SHOULD be included in the
> signature ...).
Unfortunately, this does not solve the problem. The 8bit-MIME to
7bit conversion as required(*) in RFC 1652 replaces the entire
message body, and therefore it invalidates DKIM signatures even
when the Content-Transfer-Encoding header is not signed.
Just like other MTAs that implement 8bit-MIME according to the rules,
the Postfix SMTP client has an option to ignore the rules and send
8bit-MIME anyway.
Wietse
(*) Either convert the body, or return the message as undeliverable.
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