Open beta — 100% free to start

Professional email for your domain.

Use [email protected] instead of Gmail. Full authentication, AI-powered tools, and aggressive security — at a fraction of what others charge.

Start free — no credit card See pricing →
Free forever
$0
Tiny ad line on incoming mail
Pro — no ads
$4.99/mo
per address, cancel anytime
+ AI Email API
✓ DKIM signed
✓ SPF protected
✓ DMARC enforced
✓ TLS 1.2+ encrypted
✓ Rspamd spam filter
✓ Any IMAP client
5 min
Setup time
99.9%
Uptime SLA
2048-bit
DKIM keys
$0
To get started
How it works

Three steps. Five minutes. Done.

No server knowledge needed. We guide you through every DNS record — just paste what we give you.

1

Add your domain

Type your domain name. We instantly generate DKIM keys and show every DNS record you need — MX, SPF, DKIM, DMARC — with copy buttons.

2

Paste DNS records

Copy each record into your registrar (Namecheap, Cloudflare, GoDaddy — anywhere). Our live checker shows green checkmarks as they propagate.

3

Create mailboxes

Add hello@, info@, or [email protected]. Connect any email client. You're live and authenticated.

Why ByteSMTP

Everything you need. Nothing you don't.

Enterprise-grade email infrastructure without the enterprise price tag.

🔐

DKIM + SPF + DMARC

Auto-generated 2048-bit DKIM keys. SPF and DMARC records ready to copy. Full email authentication out of the box.

🛡

Spam filtering

Powered by Rspamd — the same engine used by major ISPs. Spam scored, flagged, and quarantined automatically.

🔒

TLS everywhere

All connections encrypted with TLS 1.2+. IMAP, SMTP, and web UI — nothing travels in plaintext. Ever.

📱

Any email client

Standard IMAP + SMTP. Works with Thunderbird, Outlook, Apple Mail, Gmail app, K-9, and any other client.

🌍

Unlimited domains

Host email for as many domains as you want — main business, side projects, client domains. One dashboard.

🤖

AI diagnostics

Bounce failures diagnosed in plain English. DNS explained. Email templates generated. All powered by AI.

📊

Delivery dashboard

Every email tracked. Deliverability, bounce rates, spam scores in real time. No black box.

⚡

5-minute setup

Add domain → paste DNS → create mailbox. Live checker confirms everything works. No terminal needed.

🔨

Aggressive security

IP blacklisting, honeypot traps, brute-force auto-banning, injection detection, UFW firewall integration.

Pro exclusive

AI Email API — let your AI send & receive

Give your AI agent its own email address. Pro accounts get full API access to send, read, and auto-reply. Build support bots, lead responders, or automated workflows.

📤

AI sends email

Compose and send through your domain — fully DKIM authenticated.

📥

AI reads inbox

Pull new messages via API. Triage, extract data, classify automatically.

🔄

Smart auto-reply

AI reads context and drafts human-quality replies. Set rules per address.

🔌

Any AI provider

Claude, GPT, Copilot, or your own model. We handle the email infra.

send_email.py
# Let your AI send email — 3 lines of code
import requests

response = requests.post("https://bytesmtp.com/api/send", json={
  "from": "[email protected]",
  "to": "[email protected]",
  "subject": "Re: Your inquiry",
  "body": ai_generated_response
}, headers={"Authorization": "Bearer YOUR_API_KEY"})

# Response: {"status": "sent", "message_id": "abc123"}
Simple pricing

Free to start. Cheap to upgrade.

No tiers, no complexity. Just email — with or without a tiny ad line.

Free
$0 /forever
Per email address. No credit card.
  • ✓ Custom domain email
  • ✓ DKIM, SPF, DMARC
  • ✓ Spam filtering (Rspamd)
  • ✓ TLS encryption
  • ✓ IMAP + SMTP access
  • ✓ Delivery logs
  • ✓ 1 GB mailbox quota
  • ✓ 1-line ad on incoming
Get started free
Most popular
Pro
$4.99/mo
Per email address. Cancel anytime.
  • ✓ Everything in Free
  • ✓ No ads — clean inbox
  • ✓ 10 GB mailbox quota
  • ✓ Priority delivery
  • ✓ AI Email API access
  • ✓ AI email templates
  • ✓ Advanced spam controls
  • ✓ Forwarding & aliases
Start free, upgrade anytime
No contracts. No setup fees. No hidden charges.
Upgrade or downgrade any mailbox individually.
Price comparison

See how we stack up.

Same professional email. Fraction of the cost. Plus features they don't offer.

Provider Price /user /mo Custom domain Storage AI email API
✉
ByteSMTP Pro
 $4.99 Best value ✓ 10 GB Built-in
✉
ByteSMTP Free
 $0 with ad line ✓ 1 GB —
G
Google Workspace
 $7.00 40% more ✓ 30 GB Gemini ($$$)
M
Microsoft 365
 $6.00 20% more ✓ 50 GB Copilot ($$$)
P
ProtonMail
 $6.99 40% more ✓ 15 GB —
F
Fastmail
 $5.00 ✓ 2 GB —
T
Tuta
 $6.50 30% more ✓ 20 GB —
Z
Zoho Mail
 $1.00 Lite plan ✓ 5 GB Zia (basic)
ByteSMTP is the only provider with a free custom domain tier and built-in AI email API — no add-on pricing.
FAQ

Common questions

What does the free ad line look like? +
A single tiny line at the bottom of incoming emails — like "Sent from my iPhone." Something like: "Powered by ByteSMTP — free email hosting." It never modifies your sent emails. Upgrade to Pro to remove it.
Can I use my own domain from any registrar? +
Yes — Namecheap, Cloudflare, GoDaddy, or any registrar. You keep full domain ownership. Just add a few DNS records we provide with copy buttons.
What email clients work? +
Any standard IMAP/SMTP client: Thunderbird, Outlook, Apple Mail, Gmail app, K-9, FairEmail — anything. Server settings are right in your dashboard.
How does the AI Email API work? +
Pro accounts get an API key from the dashboard. Use it to send, read, and auto-reply via REST endpoints. Connect Claude, GPT, or any AI. Perfect for support bots, lead follow-ups, and automated workflows.
Is my email secure? +
All connections use TLS 1.2+. Emails signed with 2048-bit DKIM. Rspamd spam filtering, brute-force protection, aggressive IP firewalling. We never read or analyze your email content.
How many addresses can I create? +
Unlimited on both plans. Each address is billed independently — 3 Pro addresses = $14.97/mo. Free addresses are always free.
Can I mix Free and Pro on one domain? +
Yes! Each mailbox is independent. Client-facing on Pro (no ads), dev@ on Free. Upgrade or downgrade individually.
What if I stop paying? +
You drop to Free tier. Keep all your email — just the tiny ad line returns. We never delete mail for non-payment.

Your domain deserves
real email.

Stop using gmail.com for your business. Set up in 5 minutes, free forever. Pro with AI API for $4.99/mo.

Create your free account →