I have an Exchange 2010 Server (SBS 2012) which is behaving strangely.
The users are complaining that they get no mails for several hours on occasions and then suddenly a whole load of emails arrive in their mailboxes. Further examination has shown that the mail has been received from the Internet in a timely manner, but there has been a delay in moving it to the recipient mailbox. The report below concerns one such email:
Delivery Report for XXXX XXXXXX (firstname.lastname@example.org)
07/04/2015 19:48 xxxxxx-server.xxxxxxx.local
Message was received by xxxxxx-server.xxxxxxx.loca from in6h.electric.net.
08/04/2015 08:14 xxxxxx-server.xxxxxxx.local
The message was successfully delivered.
As you can see the message was delayed by over 12 hours.
Any idea how to go about diagnosing this?