before wasting time, can I host a mail server on my home server and use cloudflare tunnel.
or still I will have reputation problem
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I don’t think so. (I’ve asked about this on Cloudflare’s forum in the past.) You can host a mail server at home, but not through a Cloudflare tunnel. A domain’s MX record for its mail server must point to an A or AAAA record, but a Cloudflare tunnel can only be specified using a CNAME record.