Since upgrading at weekend which is when a customer external email address sends an issue, they may be a new customer or existing JETI is using their email address as the email name. IE email@example.com is the name when the mail handler sends an auto reply for issue creation and any comments. The email name and address should be firstname.lastname@example.org as this is the project and system mail handler default recipient
The name is set correctly in the incoming mail system handler for the project.
I upgraded to 3.2.1 of service desk and 7.2.2 of JIRA and this occured.
attachment of the issue created email to an external client attached
service desk 3.2.1