Cloudflare Email Support
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I use Cloudflare for a few of my domains but am now getting these kind of errors on my box.
Any way to get rid of those by adding a tickbox saying 'I use Cloudflare email' on the domain?
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Just disable the Cloudron mailserver for the domain.
Otherwise setup the DNS records accordingly.
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Also, Outbound -> Disable to disable outbound mails altogether.