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Why is DKIM in relaxed mode?

5336492 shared this idea 2 months ago

mailbox.org signs outgoing messages with relaxed DKIM rules:

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mailbox.org;

Just for information, why not use DKIM strict rules? If your MX are signing all outgoing emails, you should choose "strict mode" to make sure noone is spoofing our emails. Or do I miss something?

Kind regards,