Send Product Emails Without Verifying a Single Domain
The fastest way for founders and devs to send transactional emails (welcome messages, password resets, receipts) using their product's existing Gmail account. Zero domains to verify. Zero SMTP server stress. Just connect and send.
curl -X POST https://sendlib.samueltuoyo.com/api/send \
-H "Authorization: Bearer YOUR_KEY" \
-H "Content-Type: application/json" \
-d '{
"from": "sender@gmail.com",
"to": "user@example.com",
"subject": "Hello via Webhook!",
"html": "<p>No SMTP needed.</p>"
}'Stop verifying domains. Just send.
Traditional email APIs force you to configure DNS records and verify custom domains before sending a single email. SendLib uses the Gmail account your product already has.
| Feature | SendLib | Traditional Email APIs |
|---|---|---|
| Zero Domain Verification | Instant (No domain needed) | Required (DNS verification) |
| Free Emails Per Day | 500 to 2,000 / account | 100 / day |
| Uses Existing Product Gmail | Yes (Google OAuth2) | No (Requires SMTP server) |
Simple, Honest Pricing
Start for free, no credit card required.
Free
No credit card. No expiry. No catch.
- No custom domain needed
- Up to 10 connected Gmail accounts
- 15 API keys
- 60 API requests / minute
- 2MB HTML body · 1MB text body
- Up to 10 attachments · 25MB total
- 50 recipients per field (to/cc/bcc)
- 7 days email analytics
Pro
Higher limits & scale for growing applications.
- Everything in Free
- Up to 50 connected Gmail accounts
- Up to 100 API keys
- 300 API requests / minute
- 5MB HTML body · 2MB text body
- Up to 20 attachments · 25MB total
Three steps, then you are sending
Connect your Gmail
Sign in with Google OAuth. We never see your password, only an encrypted refresh token that you can revoke at any time.
Generate an API key
Create a key in the dashboard. Scope it to specific origins if you want, or leave it open for server-side use.
POST /api/send
One JSON request from any language. No SDK, no library, no config file. Your email is in the inbox within seconds.
Frequently Asked Questions
Got questions about how SendLib is different from other transactional email sending platforms? We have answers.
Do I need to verify my domain or configure DNS records?
No! Because SendLib routes your email relay requests securely through your already verified, connected Google accounts, there is absolutely zero DNS configuration required. You do not need to add SPF, DKIM, MX, or TXT records to start sending immediately.
Can I send from my custom domain (e.g. hello@mycompany.com)?
Yes! If your custom company domain is connected to Google Workspace, simply link that account to SendLib via Google OAuth. SendLib will send transactional emails directly from your custom domain (e.g. hello@mycompany.com) with zero extra DNS or SPF configuration required on SendLib. Plus, Google Workspace accounts get 2,000 emails/day per account!
Will my emails land in the inbox?
Yes, absolutely. Because the emails are sent using Google's official, highly trusted outbound mail servers, they inherit the absolute highest deliverability rates out of the box.
How does this compare to the free tier of Resend, Mailgun, or SendGrid?
Other platforms limit you to only 100 free emails per day on their free plans and require strict domain verification. With SendLib, you can send up to 500 emails/day per connected personal/product Gmail account, or up to 2,000 emails/day per connected Google Workspace account.
Can I send attachments and CC/BCC recipients?
Yes, our REST API supports complete transactional payloads. You can specify a custom Reply-To header, carbon copies (CC), blind carbon copies (BCC), and pass an array of base64-encoded attachments.
Is my Google account password secure?
We never see, ask for, or store your Google password. Authorization is done entirely through standard, secure Google OAuth2 credentials. We only store encrypted access and refresh tokens, which you can manually revoke from your Google Account settings page at any time.
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