I was looking at this article How to use DKIM with Ed25519 - Mailhardener knowledge base <https://www.mailhardener.com/kb/how-to-use-dkim-with-ed25519>. In the section where it discusses the "Transition period considerations" it says, and I quote:
"" As with any new standard in email, it is expected that it will take some time before Ed25519 validation is a common feature in email validators (the receiving services). As such, it is not recommended to exclusively rely on Ed25519 for DKIM. The signer (sending email service) should use a dual DKIM signature approach where the email is signed with both an Ed25519 signature, as well as an RSA signature for backward compatibility. This means that 2 DKIM DNS records must be created. One containing the Ed25519 key, and one with a fall-back RSA type key. The two DKIM DNS records must use a different selector, as DKIM does not allow multiple DKIM records to exist with the same selector. "" Is anyone already doing this with Exim? -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 "Oh, the cruft.", egrep -v '^$|^.*#' :-) -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
