A few days ago I could set a differnet project email address, but now I can't find the setting. How can I customize the project email address like I did in this screenshot?
If you are using JIRA Cloud, then the project email address feature has been temporary disabled. This is documented in the Configuring a project's email address section of the Configuring email notifications documentation page:
"This feature is currently disabled in Cloud as of June 15th but will be back soon. If you had a 'Project Email Address' configured previously using your own domain please read Configuring JIRA Cloud to send emails on behalf of your domain"
The feature should be enabled again in 3 weeks time (circa).
Atlassian Cloud Support
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