James,

I see you're using the phrase "Proxy Mode", which could potentially be confusing. The word "Mode" in Xeams has a slightly different meaning and therefore, I wanted to clarify that before answering your actual question.

1. Xeams has 3 modes - Stand-Alone, Firewall and Hybrid
2. It has two types of SMTP Servers - Proxy and Regular

I assume your running Xeams in Firewall mode and are trying to decide whether to use Proxy Server or the Regular Server, correct?

We DO NOT recommend you use the Proxy server any more. Check https://www.xeams.com/SwitchingProxy2Regular.htm for details.