[Email Routing] "No such user here" with aliases registered

General Email Routing
6

I’ve retested with the following results:
[email protected] fails with “521 5.3.0 Upstream error. bnLuqR6jnvsE”
[email protected] fails with “521 5.3.0 Upstream error. ejtl5zPFoGRs”
"Action: failed
Final-Recipient: rfc822; [email protected]
Diagnostic-Code: smtp; 521 5.3.0 Upstream error. KpjzMLC843aA
Status: 5.3.0
"
"Action: failed
Final-Recipient: rfc822; [email protected]
Diagnostic-Code: smtp; 521 5.3.0 Upstream error. 1nAiB1K88pDa
Status: 5.3.0
"

So the problem definitely remains, is fundamental to the utility of the feature, and has no known resolution. This needs the attention of the Cloudflare team.

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