DKIM is... pretty technical and kind of hard to evaluate directly. I don't actually know a ton about it. But this looks like the best way of doing it:
1. Go to https://www.appmaildev.com/en/dkim and click the "Next Step" button at the top 2. It will give you an email address. Send an email to that address from the domain you want to check 3. It will then give you a report. Find the DKIM section and expand it. Two things need to be true: It needs to say "PASS" in the summary of that section, and the big blob of text that starts with "DKIM-Signature" needs to contain "d=example.com" (if your mail is blah@example.com). If it contains something else like d=dreamhost.com, that's something that Google will frown at.
Chances are decent that Dreamhost is handling DKIM correctly -- if they control your DNS records (e.g. if you registered the domain through them) then they have the ability to set everything up correctly. And maybe they have!
If your domain name itself is managed elsewhere (with A and MX records pointing to Dreamhost) then it is likely *not* set up for DKIM.
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1. Go to https://www.appmaildev.com/en/dkim and click the "Next Step" button at the top
2. It will give you an email address. Send an email to that address from the domain you want to check
3. It will then give you a report. Find the DKIM section and expand it. Two things need to be true: It needs to say "PASS" in the summary of that section, and the big blob of text that starts with "DKIM-Signature" needs to contain "d=example.com" (if your mail is blah@example.com). If it contains something else like d=dreamhost.com, that's something that Google will frown at.
Chances are decent that Dreamhost is handling DKIM correctly -- if they control your DNS records (e.g. if you registered the domain through them) then they have the ability to set everything up correctly. And maybe they have!
If your domain name itself is managed elsewhere (with A and MX records pointing to Dreamhost) then it is likely *not* set up for DKIM.