I have 4 Exchange 5.5 servers, one main server that has the IMS installed. Suddenly today the MTA on the main Exchange 5.5 server started failing. The MTA service would stop. I noticed its creating hundreds of .dat files of varying size, but when opening with notepad, they just have a solid black block at the top left corner. They don't appear to be valid files. This is our main server, incoming and outgoing mail is routed through this one server. Its important I get it back online ASAP. I've run the MTACHECK tool and it finds nothing wrong. The MTA service will run but the MTADATA folder has over 10,000 files in it over 3GB of data. Every time I start the MTA service, it creates hundreds of files per minute and is going nuts. I'm down to 300MB of freespace on this machine. Any ideas or suggestions?
This is a mixed org with Exchange 2003 and the ADC as well. I've already checked internet connectivity and DNS confg. Everything seems to be working fine, except for the MTA service.