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Use rsa-sha256 for DKIM signatures

David Verdin requested to merge github/fork/fmeum/sympa-6.2 into sympa-6.2

Created by: fmeum

Sympa currently uses rsa-sha1 for DKIM signature attached to outgoing mails. It has been shown that SHA-1 can no longer be considered resistant to collisions in practice, which means that it is inadequate to be used with DKIM. Since Mail::DKIM supports rsa-sha256, this is easy to fix.

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