60% of mail recipients were rejected by their server Sender domain is blocklisted in 550-5.7.1

First try at sending mails. About 60% were returned Sender domain is blocklisted in 550-5.7.1 My investment in Cloudflare is therefore somewhat troublesome. No value to me if the emails can’t get through

Cloudflare doesn’t provide any service to SEND emails.

Rather than pointing fingers and throwing in the towel, maybe you can provide us with some details so we can help you identify where the problem is and fix it.

To begin with, what’s this “sender domain” in question?


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