Any email spooled from our service will come from the following IP addresses:
Please do not whitelist the above addresses. Your standard anti-spam measures should be employed against the mail you receive from our backup mx service. Instead please make sure your firewall or anti-spam device does not do any throttling to any rate and connection limits against connections from the above IP addresses.
NOTE: If you also subscribe to our ClearMX anti-spam filtering service and use the backup mx service in conjunction with that you can safely whitelist the above IP addresses.