How we built real-time mail routing with tRPC and PostgreSQL
A technical deep-dive into the routing engine that powers USMail's intelligent mail distribution.
BLOG
Insights on business mail,
automation, and teams.
Practical guides, product updates, and thinking from the USMail team.
Product
March 2025
Introducing USMail: the automated business mail workspace
We built USMail because every business mail solution we tried was either a basic inbox or an overcomplicated helpdesk. There had to be a better way.
Read articleEngineering
Product
Why shared inboxes fail — and what to do instead
The shared inbox is broken by design. Here's the structural problem and how modern teams are solving it.
Security
Email security in 2025: What every business needs to know
SPF, DKIM, DMARC, TLS — what they mean, why they matter, and how USMail handles them for you.
Product
Templates that actually save time
How to build a template library that your whole team actually uses — with real examples from USMail customers.
Engineering
Building a multi-tenant mail system: lessons from production
What we learned building USMail's infrastructure to handle thousands of domains on a single platform.
Company
Why we're building the operating layer for business mail
Our vision for what business mail infrastructure should look like — and why the current tools aren't enough.