How to resolve mail handler error? You don't have permission to access this service project. failed

[felicia_wilkes]

How do I change the customer permission to avoid the above mail handler error? I have the Jira service management cloud edition. 

[Angélica Luz]

Hello @felicia_wilkes,

Thank you for reaching out to Atlassian Community!

The best way to avoid this type of error is to open the project to anyone with an account on the site to create tickets and for that, it's necessary to change the customer permissions.

Classic project: Project settings > Customer permissions.

Next-gen project: Service Project settings > Channels > Customer permissions. 

On this page, select the option "Anyone with an account on xxxxxx.atlassian.net" or "Anyone on the web" > Save.

After that, any customer or user that access the portal or send a request via email will be able to create the ticket on the project.

Regards,
Angélica