Steps

• Setup JIRA with an incoming create or comment email handler.
• Set up a user with an email address and change its profile so they are notified of their own changes.
• Login as that user.
• Create an issue that has one of the new priority icons in it.
• Check that user's inbox in Thunderbird/MS Outlook.
• You should see a issue creation notification email and the new priority icon should be in it.
• Reply to this email so that a comment gets added to the JIRA issue.
• Check the JIRA issue in the browser.
• [BUG] A new comment will be added to the issue, and the priority icon will be added as an attachment to it.

Root Cause

This is caused because this images were not checked into source tagged with the png metadata that is necessary for any email image sent from JIRA is meant for inclusion as an embedded image in email messages.

Any image that is to be sent from JIRA in an email message needs to be tagged via PNG metadata so that the incoming mail handlers can identify them and not add them as attachments to the JIRA issue.

Notes

From previous testing in this are we believe this will affect all email clients except outlook. All mail templates that include the priority icon in it will be affected (not only issue creation).

Replies to issue comment notifications are not affected given that the issue comment notification email does not show the Priority field.