Hi,
So I have a single Exchange 2013 server. We recently migrated from Exchange 2007 (and that server has been decommissioned). We use Solarwinds Orion for network monitoring. It has an alerting function. I added the IP address of the Solarwinds sever to our internal relay Receive Connector so Exchange will accept messages from the Solarwinds server. I can send alerts to any internal email address successfully (for instance I set the recipient to my own email address and it worked). However, we want to be able to have alerts go to our pager. So I put in the recipient address ofxxxxxxxxxx@usamobility.net. This function works perfectly fine for other systems that we have alerting set up on (for instance we use APC Struxtureware for alerting our pager on power outages). I am also able to send an email to the pager from my Outlook. However, the Solarwinds server logs this error:
The server rejected one or more recipient addresses. The server response was: 550 5.7.1 Unable to relay
The only way I'm able to get it to go through successfully is if I go to Mail Flow > Accepted Domains and add usamobility.net as aninternal relay. I'm sure that nobody is going to hack into our network and start spamming us with emails to usamobility.net but is this a bad practice? What type of security threats am I open to? Am I doing this wrong is there another way around this problem?
Thanks in advance!