About
We build email infrastructure for people who care about the inbox.
Inbox OSS is a product of One Source Soft — a team of operators, deliverability engineers, and platform builders who got tired of opaque pricing and impersonal email vendors.
2023
Founded
14B+
Emails delivered
6
Global regions
100%
Open source core
Principles
What we believe
Deliverability is a product
Most platforms treat deliverability as a setting. We treat it as our north star — instrumented, monitored, and surfaced to you.
Open by default
Inbox OSS is, well, open source. Self-host or use our cloud. Same code path. Same guarantees. No vendor lock-in.
Predictable pricing
You should be able to budget for email. No surprise overage, no per-feature upsell, no migration tax at scale.
Real humans in support
Senior deliverability engineers, not chatbots. Community Slack for the free tier, dedicated CSMs for Enterprise.
Join us in fixing email.
Open positions on our careers page. Or just say hi.