As a precaution, or if you find that encrypted replies to your messages are being classified by SPAM by your e-mail provider, you can whitelist the following IP's. The following IP's deliver any replies from the secure portal to your e-mail server.

If SpamTitan is being used for multiple domains and/or tenants, whitelisting the following IP's is required. 

You can whitelist our IP addresses by logging into SpamTitan and navigating to System Setup > Mail Relay > IP Controls > Whitelisted IPs, and entering the following networks.,,