Question : Undeliverable message 4.4.7 and MTA not active

I found your resolve for the 4.4.7, but all it said was find out what the MTA says.  My MTA is not active, which your database says is normal.   Most of our emails go out fine, but with a few companies  I keep getting the 4.4.7 error.  I have sbs 2003.  

Answer : Undeliverable message 4.4.7 and MTA not active

Usually a 4.4.7 message is a temporary problem on the receiver's end.  Are you sure this is actually a problem with your mail server?

Is there any pattern on the companies you're having problems e-mailing?