About
KaiMail is a developer-focused email forwarding service for custom domains. It accepts mail through MX records, forwards messages to an existing inbox with ARC and DKIM signing, and can also deliver inbound mail as JSON payloads over HTTP webhooks.
The pricing page lists a free Basic plan with 1 custom domain, 1 mailbox, up to 300 received emails per month, 1 MB maximum email size, and 1 day of log retention. Paid plans add webhook delivery, multiple forwards, mailing lists, SMTP sending, higher domain and mailbox limits, larger message sizes, and longer log retention.
- Custom domain email forwarding
- ARC and DKIM signing
- 300 emails per month free
- 1 custom domain limit
- 1 mailbox limit
- 1 MB maximum email size
- 1 day log retention
- Webhook and SMTP features on paid plans
Free Tier Value
This free tier is a genuinely usable starter plan, but it is tightly capped: one domain, one mailbox, modest monthly email volume, small message size, and only a day of logs. Compared with the cheapest paid plan at about $5.50/month, it delivers roughly a third to two-fifths of the practical value, so about $2/month is a fair estimate. A credit card is not required, and the offer is perpetual but clearly limited rather than unlimited.
What's included in the free tier
- Email forwarding with the free plan.
- ARC/DKIM signing included.
- 1 custom domain allowed.
- 1 mailbox included.
- Receive up to 300 emails per month.
- Maximum email size of 1 MB.
- 1 day of logs retention.
See KaiMail pricing for current limits.
Paid plans
KaiMail Plus
- custom domains
- 2
- mailboxes
- 5
- received emails/month
- 5k
- max email size
- 10MB
- logs retention
- 7 days
- SMTP sending/month
- 500
- Email forwarding
- ARC/DKIM signing
- Webhook delivery
- Multiple forwards
- Mailing list (public, broadcast, discussion)
- SMTP sending (500/month)
KaiMail Pro
- custom domains
- 10
- mailboxes
- 20
- received emails/month
- 10k
- max email size
- 25MB
- logs retention
- 30 days
- SMTP sending/month
- 1,000
- Email forwarding
- ARC/DKIM signing
- Webhook delivery
- Multiple forwards
- Mailing list (public, broadcast, discussion)
- SMTP sending (1,000/month)
KaiMail Business
- custom domains
- 50
- mailboxes
- Unlimited
- received emails/month
- 50k
- max email size
- 35MB
- logs retention
- 30 days
- SMTP sending/month
- 2,000
- Email forwarding
- ARC/DKIM signing
- Webhook delivery
- Multiple forwards
- Mailing list (public, broadcast, discussion)
- SMTP sending (2,000/month)
- Priority support
Pricing extracted from KaiMail's pricing page. Always verify current pricing before committing.
