When useing Cloudflares proxy, is it possible to use SMTP, SQL, IMAP e.g?

Is it not possible to use Cloudflares proxy when having a smtp or database server on the domain name?

Correct. Cloudflare only proxies HTTP(S) traffic.

For a database server, I usually configure my web app to connect to ‘localhost’ since they generally run on the same machine. Or the IP address if it’s not on the same machine.

SMTP is usually on a dedicated server or subdomain. But if not, yes, that would be a problem.

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It’s not possible to use them on the same host name, but you can use alternate host names for that purpose and/or configure your server to resolve hostnames locally /bypass Cloudflare for DB connections.

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