David Chisnall (*Now with 50% more sarcasm!*)I wonder how much this worked because you had a clean reputation for the domain. I’ve been using the same domain for my primary email for 20+ years, so by now the big providers have it on their ‘probably not a spammer’ list. When I added some new domains. They used the same DKIM key and same sender IP, which probably helped. I didn’t have any problems with sending to Google or MS domains (when I was at MS, I tried sending a mail from my mail server pretending to be from a microsoft.com email address and it arrived too!).
But I’ve heard people setting up a new mail server have a much worse experience.
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