Hello,
upon receiving an email with:
To: Aaaaaaa aaa Aaaaaaaa <aaaa...@example33.org>,Bbb bbb Bbbbbbbbbb
<b...@example.int>
- notice the missing space after the comma - sendmail passes the
unmodified header to milters, e.g. for adding DKIM-Signature, and then
rewrites the header to
To: Aaaaaaa aaa Aaaaaaaa <aaaa...@example33.org>,
Bbb bbb Bbbbbbbbbb
<b...@example.int>
The introduction of a white space/new line after the comma is not
conformant to DKIM relaxed Header Canonicalization Algorithm (https://t
ools.ietf.org/html/rfc6376#section-3.4.2): this change breaks the
signature, just made by the milter.
Does postfix (consider the header as valid and therefore) keep the
header unchanged?
Regards
Дилян
