Hi tpetry - Giri Sreenivas, co-founder and CEO of Helm here. You raise an important issue with residential IP addresses not being trusted by email senders. This

Hi tpetry - Giri Sreenivas, co-founder and CEO of Helm here. You raise an important issue with residential IP addresses not being trusted by email senders. This is why we use a static IP address assigned to a gateway for each customer. The Helm Server appears to have this IP when communicating with other email servers. This also allows us to define reverse DNS for a domain which is another marker of trust for email servers.