KaiMail Reviews — Discover what people think of this product.

KaiMail

Custom domain emails, Simplified

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KaiMail is a SaaS email forwarding and sending service for custom domains. Built by an email infrastructure veteran, it lets developers and businesses receive, send, and automate email without running a mail server. Differentiators include ARC signing for reliable deliverability, native webhooks for app integrations, SMTP/HTTP API sending, and bounce tracking. Flat JPY pricing, bilingual UI, and a free tier make it ideal for small teams and indie developers.

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What does KaiMail help with?

KaiMail solves the problem every developer faces: you buy domains for side projects, but setting up email for them means either running a mail server or paying per-user fees for Google Workspace.

We built KaiMail on patched qmail with full ARC/DKIM/SPF authentication — the only forwarding service that implements ARC signing, which keeps forwarded emails out of spam as Gmail and Yahoo enforce stricter DMARC policies.

Key features

Email forwarding & sending on your own domain
Native webhooks — HTTP POST on every incoming email, no code required
SMTP or HTTP API for sending from desktop clients or your app
Bounce tracking with dynamic MAIL FROM
Multiple forwards
Easy email list creation

We also have a special program for OSS developers and open-source community organizers to use their own domains.

KaiMail Reviews — Discover what people think of this product.

KaiMail

What does KaiMail help with?

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