My Exchange Server suddenly quit sending internal email and we cannot fix it. I am running Exchange 2007 SP1 on Windows 2003 servers which are all VMware virtual machines. I have the functions broken out over three servers, MXstore is one, MXhub transport is one another , and MXClient is on the third. I have been running tis environment for over 2 years without issue. I have not applied any updates to either VMware or Exchange or Windows in the last couple of weeks.
I believe this has something to do with either the MapiDelivery service or DNS or??? because I can send outbound SMTP mail without issue. I receive inbound mail but is just sits in the Mapideliver queue as does internal emails. I have tried stopping/starting transport service, MXStore service, and mail submission service. During the course of these actions, the Mapidelivery queue release a few emails. Sometimes 100 will go sometimes none go. I cannot find any consistent patteren as to why they go or don't.
I have started examining the DNS and DC replication on my domain but I wanted to put this out to the communitiy for help because M$ won't give me any due to the fact my boxes are VM's.
Thanks in advance for your help.