Support DKIM l= tag (body length)

[agners]

The l= tag is useful for mailing lists and message handling system which add content to the end... The dkim_sign function has a parameter for body length, I guess if the whole body length is passed, the function should add the l= tag and sign the complete mail.

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[vstakhov]

Nope, dkim context is obtained when the whole length of message is yet unknown. Anyway, I don't see any useful application of l= in the context of rmilter.

[agners]

Well, when sending emails to mailing list, would be worthwhile I guess? Currently my emails fail DKIM signature when I receive them back through the mailing list...

I there another way to archive this with a rmilter/rspamd (maybe second OpenDKIM milter?)