Hello, We're currently exploring the possibility of migrating from signing as the individual hostnames of our sending IPs to signing as the org domain aligned with those hostnames (e.g. signing as example.com instead of mail1.example.com). Our main concern is in regards to deliverability, as we'd presumably lose years of sending history that we've accumulated with those signing domains.
To potentially mitigate impact from the change, I'm considering having the d= be the org domain, while i= could remain the actual hostname we've historically signed with. So with the example above, they'd be d=example.com and [email protected]. Would anyone know off hand whether we could expect that to help preserve the reputation we've built as a sender, given that the i= also carries reputation (from what I've read)? Thanks! - Jonathan Leist
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