We have a third party vendor trying to send email through our Exchange 2003 server. I've supplied them with the info they needed from the image
. I've added their IP address to the SMTP Virtual Server Properties Relay restrictions Allow list. When they try to send mail they get this as a error:
Failure sending mail.; Unable to connect to the remote server; A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond x.x.x.x:25
Not sure where to go from here?