Azure Communication Service / Email - 550 5.1.1 response seems to be cached

Dean Landry 0 Reputation points

We are using the email portion of Azure Communication Services to send email from an application. It is working to send from our own domain to everyone at a customer domain except for 1 user. It looks like we emailed the user before the account setup was complete so it bounced with a 5.1.1 error (no such mailbox). I'd expect that first error. However, now that the account is working properly (we can email them from other external domains), it continues to return a 5.1.1 error. It's as if the ACS has remembered the error and cached it - so it's no longer retrying.

Has anyone experienced anything like this before?

Azure Communication Services
Azure Communication Services
An Azure communication platform for deploying applications across devices and platforms.
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  1. Grmacjon-MSFT 16,441 Reputation points

    yes, that is correct. but it might be faster for them to create an alias for the user instead of waiting for 14 days but if the issue persists after 14 days please do let us know

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