What you'll need
- A Resend account (free tier available)
- A verified sending domain (or use [email protected] for testing)
Step 1 — Generate an API Key
1
Sign in to resend.com/api-keys.
2
Click Create API Key.
3
Give it a name (e.g. "Telemantix CRM") and select Full Access or Sending Access.
4
Copy the key immediately — it's only shown once.
Step 2 — Verify Your Sending Domain
1
Go to resend.com/domains → Add Domain.
2
Enter your domain (e.g.
yourcompany.com).3
Add the displayed DNS records (SPF, DKIM) to your domain registrar.
4
Click Verify DNS Records once propagation is complete (up to 48h).
For testing, you can skip domain verification and use [email protected] as the from address.
Step 3 — Connect in Telemantix
1
Go to Email Settings → Resend tab.
2
Paste your API Key.
3
Enter your From Email using your verified domain (e.g.
[email protected]).4
Click Save & Connect.
Step 4 — Send a Test Email
1
In Integrations → Resend → Configure, click Send Test Email.
2
Telemantix will send a test message to your admin email via the Resend API.
3
Check your inbox and the Email Logs section to confirm delivery.
Fields Reference
API KeyYour Resend API key starting with re_. Found at resend.com/api-keys.
From EmailThe email address emails will be sent from. Must use a verified domain, or [email protected] for testing.
Webhook signing secretCopy the whsec_ signing secret from Resend Webhooks into Integrations → Resend → Configure. Use the callback URL shown on the saved Resend card for delivery, bounce and complaint events. Unsigned delivery updates are rejected.
Common Issues
Emails going to spam
Verify your sending domain in Resend and ensure SPF/DKIM records are correctly set. Avoid using free email addresses (@gmail.com, @yahoo.com) as the from address.
API key invalid
Ensure you copied the full key (starts with re_). Keys are only shown once — if lost, generate a new one.
Domain verification stuck
DNS changes can take up to 48 hours. Use resend.com/domains to check record status. Try clicking Verify DNS Records again after waiting.
Still stuck?
WhatsApp us on +91 99103 43016 or raise a ticket from Support Tickets inside the app.
Related guides
Connect WhatsApp Cloud APISend and receive WhatsApp messages from leads directly inside Telemantix.Connect Meta (Facebook & Instagram) Lead AdsNew lead-form submissions from Facebook and Instagram ads arrive as leads instantly.Connect Google Ads lead formsPull leads from Google Ads lead form extensions into Telemantix.