Service Desk Mail Handler is not creating tickets for all emails

[Kara Brake]

We are using Jira service desk 4.3.3 with O365 (IMAP).  Emails are sent to our inbox where Jira is supposed to pick them up, mark them as read, and create tickets.  For some reason, 2 out of 5 (on average) emails are not being created as tickets, even though the mail handler is marking them as read.  The mail log shows nothing for these emails, as if the mail handler never saw them.  

As a workaround, we have to mark the request as unread and see if the mail handler will pick up the email then.  Of course this is not ideal.

Has anyone else experienced this issue or have some advice?

[Kara Brake]

This was resolved.  The mail handler for our staging environment was inadvertently turned on, therefore grabbing emails along with our prod environments mail handler.