452 4.3.1 Insufficient system resources
Starting from Exchange 2007, the edge transport service uses the system resource monitoring feauture to determine vital resources such as hard drive space and memory and take action in an attempt to prevent service outages. This can be a pain as the whole thing is calculated on a formula,100 * (hard disk size – fixed constant) / hard disk size, this feature is called Backup pressure.
Now simply put, you have this error from other smtp servers trying to contact yours : Insufficient System resources, to get around this you will need to increase the hard drive space or memory, until then you could temporarily disable this monitoring feature so that you can start receiving important emails. WARNING: this is not a recommended permanent solution, do this until youve figured what resource needs looking at i.e hard drive space, RAM etc.
Make a backup copy of the edgetransport.exe.config file before you start.
- Open the EdgeTransport.exe.config file from \Exchange Server\bin directory using notepad
- Add the following key+value pair:
<add key=”EnableResourceMonitoring” value=”false” /> - Save file
- Restart the Microsoft Exchange Transport Service (MSExchangeTransport):
Restart-Service MSExchangeTransport - and you’ve got mail
Other options are to
configure the edgetransport.exe config file to reflect your server configuration and resources (not recommended by MS)