One bug per Jira ticket. Please do not report multiple bugs within one single Jira Issue. Otherwise, it makes it very difficult to have focused discussion and track progress.
Even if you encountered several issues at once, you should open a separate Jira Issue for each and Link issues together.
Keep ongoing communication in JIRA. Email does not scale. Emails are lost. Use Jira to provide all necessary Logs, code snippets, screenshots.
The JIRA Issue Summary should be precise and informative about the issue it is reporting: "X is broken" is not a helpful description. "X is doing Y instead of Z" is much better.
Provide a link to the original user story if you can
Provide more details on the issue in the Description field
Describe the error you see, and describe the behavior expected
Provide steps to reproduce the error
If possible, provide actual commands to run
Attach logs or screenshots
Try to reduce the problem to the smallest possible use case to make it easier to reproduce the bug and to test the solution