Some emails are beeing rejected

I don’t receive emails
The client email provider says

error dialing remote address: dial tcp
167.89.107.59:0->104.21.9.171:25: i/o timeout

My email provider says that Cloudflare is blocking this email.
I have checked the DNS configuration on Cloudflare and it seems to be OK. Besides my test emails are beeing sent correctly, so I am not sure why Cloudflare sometimes rejects emails.

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