Always using the relaxed body canonicalization is invalid per DKIM - RFC 6376 #21
Description
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That executes
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relaxed canonicalization is always executed. The protocol specifies that simple/simple is the default. That is not valid per RFC 6376 because the DKIM header does not need to contain the c= tag and simple/simple is the default.
c= Message canonicalization (plain-text; OPTIONAL, default is "simple/simple"). This tag informs the Verifier of the type of canonicalization used to prepare the message for signing. It consists of two names separated by a "slash" (%d47) character, corresponding to the header and body canonicalization algorithms, respectively. These algorithms are described in [Section 3.4](https://www.rfc-editor.org/rfc/rfc6376#section-3.4). If only one algorithm is named, that algorithm is used for the header and "simple" is used for the body. For example, "c=relaxed" is treated the same as "c=relaxed/simple".