Ticket Not Reopening from Hold

Ticket Not Reopening from Hold

We have had several tickets that are placed "On Hold" because I'm waiting for a response from one of my colleagues. If a requester or someone outside our domain emails to that ticket the ticket automatically switches to "Open" however when an email comes from one of my colleagues (an internal address) it does not however if I respond to the ticket it will switch to open. I went as far as to add a business rule to state if the ticket is updated by an email with our domain to set it to open. Once again it works for an email from me but not a colleague. Am I missing something?
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