Summary

In JIRA 7.0.x+, if you attempt to delete a user with a full email address as a username and that user has issues associated, when you click on the Assigned Issue link JQL will throw an error that the @ is a reserved JQL character. This forces the end user to escape the character or put quotes around the user name.

Steps to Reproduce

1. Install JIRA 7.1.0
2. Create a user with a full email address as a username, e.g. user@host.com
3. Assign that user an issue
4. Attempt to delete the issue
5. Click on the Assigned Issue link in the pop up box that states "Cannot delete user. user@host.com has associations in JIRA that cannot be removed automatically"

Expected Results

JIRA will find the users issues and not throw an error
Actual Results
JQL throws an error stating the @ sign is a reserved keyword

Notes

I tested with 6.4.13 as well and this behavior does not occur

Workaround

Add quotations around the user name