Question 1

What is KumoMTA?

Accepted Answer

KumoMTA is a high-performance, open-source mail transfer agent (MTA) written in Rust, licensed under Apache 2.0. It is designed for enterprise email sending at scale, capable of processing billions of emails per month. PostMTA is built on top of KumoMTA.

Question 2

Is PostMTA fully self-hosted?

Accepted Answer

Yes. PostMTA deploys entirely on your own infrastructure — AWS, GCP, Azure, or bare metal Linux servers. Your email data never leaves your environment.

Question 3

What is the Apache 2.0 license?

Accepted Answer

Apache 2.0 is an open-source software license that permits free commercial use, modification, and distribution. KumoMTA's Apache 2.0 license means PostMTA has no vendor lock-in and is fully auditable.

Question 4

How does PostMTA compare to PowerMTA?

Accepted Answer

PostMTA is built on KumoMTA, an open-source Apache 2.0 MTA with no per-server licensing fees. PowerMTA is a proprietary platform with per-server licensing costs. Both handle high-volume email delivery, but KumoMTA/PostMTA offers greater cost efficiency and flexibility.

Question 5

Where is PostMTA based?

Accepted Answer

PostMTA is headquartered at 1090 West Georgia Street, Suite 488, Vancouver, BC V6E 3V7, Canada. Contact us at help@postmta.com or +1 (604) 206-8169.

PostMTA — Enterprise Email Delivery Infrastructure Built on KumoMTA