Mail arrives at Exchange server we know this because we have logging turned on, but the mail appears to go into limbo for anything up to 2 hours before it gets delivered to users mail box, there is no difference between outlook client or if the user logs on using owa, the email is not shown. when exchange does decide which it does it will deliver all messages it has received in one go so all show up with in 30 seconds at the same time in users in box. we have put on the recent Exchange SP1 hopping this would solve the issue, the server is brand new and has 2tb of storage available CPU is hardly doing anything. all other aspects of server are normal file shares printing etc. Just mail delivery is VERY VERY slow and then it all comes at once.
We have tried restarting the server some times this does help other occasions it makes not difference. server has I3-3420 cpu with 16gb ram. This is driving us bonkers please can some body give us some guidance as what to do check or alter.
Thanks in advance.
Richard