Any email spooled from our service will come from the following IP addresses:

• 54.149.19.224
• 54.149.147.54

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.