For some reason, an invalid email address can find its way in Atlassian Accounts (e.g., the email address does not exist yet because it is being created as part of the same workflow). When the issue for the invalid email address has been fixed, email invitations can no longer be sent from Atlassian Cloud because the email address has already been blocked in the back-end. Furthermore, Atlassian Cloud will show a misleading notification that the email has been sent.
1. In the User Management page of a cloud instance, create a user using an invalid email (email address not yet created or mailbox is full). Make sure to check Send invitation email.
2. Fix the issue for the email address and make sure it is able to receive emails properly.
3. Recreate the user or resend the invite in the cloud instance using the same email address.
Atlassian Cloud should specify that the email invitation was not sent or even specify that the email was blocked.
User will be notified that the email has been sent.
Although email bounce mainly happens in invite flow, it potentially happens to every type of emails due to receiver's email unavailability.
**Updated: with the latest fix, you're now able to unblock a recipient email that you suspect was blocked via the 'Resend' link in User Management. This will unblock emails automatically before resending
For newly created accounts, please, wait for a few hours before inviting them to your Atlassian Cloud apps, this will allow time for the server to replicate the account.
Please contact Atlassian Support to check if the status of the email address.