Deleted projects with custom email domains still require verification

Summary

Due to recent changes on the Atlassian Cloud, users are being notified when there's a no verified email domain set as "Project Email Address". Details can be found on the following article: Configuring JIRA Cloud to send emails on behalf of your domain

However, some customers may still receive notifications and that could be caused by a deleted project which had a custom Project Email Address.

Steps to Reproduce

1. Create a Project.
2. Set a custom email address for the project.
3. Delete the project.

Expected Results

You'll not receive warnings about a not verified 'Project Email Address'.

Actual Results

You'll still receive such warnings.

Workaround

Contact Atlassian Support.