Wildcard DNS and DKIM/SPF
Solved
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@thoresson I think you are using a mail relay . With a mail relay, those records are set up depending on the relay provider .
@joseph That's right! I thought that was the easiest way to increase the deliverability of emails sent from my Cloudron server. But apparently my understanding of DNS is lacking.
I checked my VPS' ip address and it's not in any blacklists, so switching to the internal SMTP server.
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