Building a Static Egress IP Relay

Thu, 08 Oct 2026 10:00:00 +0200

Every outbound call SimpleWP makes to a hosting partner has to arrive from somewhere that partner’s own system already trusts. At SimpleWP, calls to WordPress.com’s WP Cloud platform and to DotRoll’s cPanel hosting both rely on one static egress IP address, run by the engineers behind SimpleWP as a relay the team built and operates itself. This is the story of how that relay was designed, what one missing access path revealed once it shipped, and how the design evolved without ever changing what actually keeps it safe. A static egress IP relay sounds like a small piece of plumbing until the day a partner’s allowlist is the only thing standing between a working integration and a silent one.

Reliability on Software - art

Building a Static Egress IP Relay