[DNS] Email undeliverable when using Cloudflare

Cloudflare does not proxy traffic on port 25 (SMTP) unless Cloudflare Spectrum is enabled and configured to proxy email traffic across Cloudflare. If you do not have Spectrum enabled, then no email traffic (SMTP) will actually pass through Cloudflare, and we will simply resolve the DNS. This also means that any DNS record used to send email traffic must be grey-clouded to bypass the Cloudflare network.

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