Email Routing to xmhahamail.com and menghamail.com
Hello, in last 2 days we noticed mails towards the 2 mentioned domains not delivering due to the following smtp response:
421 4.3.0 Upstream error, please check https://developers.cloudflare.com/email-routing/postmaster for possible reasons why. VVNhHjZl0OJU
Could you kindly check what could be the issue?
421 4.3.0 Upstream error, please check https://developers.cloudflare.com/email-routing/postmaster for possible reasons why. VVNhHjZl0OJU
Could you kindly check what could be the issue?
Cloudflare Docs
Reference page with postmaster information for professionals, as well as a known limitations section.
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