When the end user send email from their gmail or mail, the ticket status in JIRA changes but the content is not seen via., JIRA. The same content is visible only via., email.
Similarly when we send comments via., JIRA to the End-user's email, the contents is not visble to the user. It appears as a blank message with no content. At times mail is not sent. We are not receiving any not delivered message as a notification.