KaiMail

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Code · Vendor site 2026-10-04

KaiMail is a developer-first email service for custom domains. It provides forwarding, ARC/DKIM signing, webhook delivery, SMTP sending, and mailing lists with a simple control panel, targeting teams that want domain email without running their own mail stack.

Updated 2026-10-04View sources

Official website

Category: Code
Free access: KaiMail Basic is listed as free with one custom domain, one mailbox, and receive limits of 300 emails per month.
API access: Docs and pricing mention webhook delivery, SMTP sending, and HTTP sending features on paid tiers.

Is KaiMail right for you?

A good fit for

Developers and small teams needing branded domain email, inbound webhooks, and lightweight SMTP without managing Postfix or Google Workspace.

Before you choose

Public pricing is quoted in Japanese yen (for example ¥550/month for Plus) with no explicit monthly USD prices on the pricing page.

Domain email for developers

KaiMail markets custom-domain forwarding and sending with signing, webhooks, SMTP, and tiered mailbox limits for developers who want infrastructure-style email instead of a consumer inbox product.

What it can do

Features & capabilities

Unknown is different from unavailable. Each fact carries its own evidence.

Capability	Value	Evidence	Checked
Custom domain email	Meta description states KaiMail simplifies receive and send email for custom domains with ARC/DKIM signing.	Facts sourced	2026-10-04
Webhook delivery	Pricing table includes webhook delivery on Plus, Pro, and Business plans.	Facts sourced	2026-10-04
No card signup	Homepage meta notes simple setup with no credit card required to start.	Facts sourced	2026-10-04

Understand the total cost

KaiMail pricing & plans

Free

KaiMail Basic is listed as free with one custom domain, one mailbox, and receive limits of 300 emails per month.

Access: KaiMail Basic is listed as free with one custom domain, one mailbox, and receive limits of 300 emails per month.

Explore pricing & history

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The practical questions

Frequently asked questions

What is KaiMail used for?

Does KaiMail have a free plan?

KaiMail Basic is listed as free with one custom domain, one mailbox, and receive limits of 300 emails per month.. This record lists ongoing free access; check the plan limits before starting.

How much does KaiMail cost?

No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.

Can I use KaiMail through an API?

Docs and pricing mention webhook delivery, SMTP sending, and HTTP sending features on paid tiers.. API access and subscription access may have different terms; consult the linked sources.

What should I check before choosing it?

Public pricing is quoted in Japanese yen (for example ¥550/month for Plus) with no explicit monthly USD prices on the pricing page.

Price history

No retained pricing changes yet. A current price alone does not establish a historical trend.

How this profile is supported

Identity and profile

Reviewed vendor source

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2026-10-04

Facts apply to the named version and check date. Send a sourced correction if something changed.