We are seeing email delivery latency with ticket creation, updates to tickets lately.  It is not happening all of the time, but sporadically. Some emails will come in an hour after a ticket is updated, and have had some where the emails are not reaching their target from 4 hours and have had a few up to 13 hours after a ticket was updated.  

Looking through the archives, it seems this has been a topic  of conversation, but wanted to see if any  others are experiencing this type of latency?