No rDNS found for 104.28.20.231

Emails keep getting getting marked as spam or being rejected altogether.

It looks like theres no valid rDNS according to https://matrix.spfbl.net/en/104.28.20.231

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Can anything be done about this?

rDNS should have no impact on modern mail servers, and you cannot get reverse DNS for any Cloudflare IP address.

You should investigate SPF, DKIM and DMARC to improve mail deliverability. Perhaps using a service like https://dmarcian.com

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