mails0 vs hosted alternatives

Same capabilities. Different philosophy.

mails0.com

License

MIT, fully open source

Cost

$0/month. Cloudflare free tier covers everything.

Data

Your Cloudflare account, your D1 database, your R2 storage. You own it.

Deploy

Self-hosted on your domain. Or use hosted @mails0.com for free.

Audit

Full source code. Read every line. Fork and modify.

Vendor lock-in

None. Standard Cloudflare Workers. Export anytime.

Hosted services (AgentMail, etc.)

License

Closed source, proprietary

Cost

Usage-based pricing, scales with agent count

Data

Stored on vendor servers. You access via API.

Deploy

SaaS only. No self-hosted option.

Audit

Trust the vendor. No source access.

Vendor lock-in

Proprietary API. Migration requires rewrite.

Why self-hosted email for agents?

Data sovereignty

Your agents handle sensitive data: verification codes, account credentials, business communications. With mails0, that data lives in your Cloudflare account, your D1 database. Not on a third-party server. Not accessible to a vendor's employees. Not subject to a vendor's data retention policies.

Zero marginal cost

Cloudflare's free tier includes Workers, D1, R2, and Email Routing. For most agent workloads (hundreds of mailboxes, thousands of emails/day), you pay nothing. Hosted services charge per mailbox, per message, or per API call. At scale, that adds up.

No vendor dependency

If your agent email provider raises prices, changes their API, or shuts down, you scramble. With mails0, the code is MIT-licensed on GitHub. Fork it. Modify it. It runs on commodity infrastructure (Cloudflare Workers) that you control.

Get started free →