Email API
Email API and SMTP that Lands in the Inbox
Send receipts, password resets, invoices and newsletters from your app or website, with the domain setup and tracking that keep them out of spam.
- REST API and SMTP relay
- SPF, DKIM and DMARC set up for you
- Opens, clicks, bounces and complaints tracked
- Transactional and marketing streams kept apart
Office in Sector 115, Mohali · +91 70180 62319
- DLT registeredCommercial SMS in India
Meta WhatsAppBusiness Partner
30-minute call, Mon to Fri
Book a demo
Email API
What is an email API?
An email API lets your website, app or software send emails automatically: order confirmations, password resets, invoices, alerts and reports. SMTP relay does the same job for systems that already send email and just need a reliable server to send through.
Getting emails into the inbox depends on how your domain is set up and how you send. We configure SPF, DKIM and DMARC, keep transactional mail separate from marketing mail and handle bounces and unsubscribes, which Gmail and Yahoo now require from bulk senders.
- Zenspire StoreYour order #4821 is confirmedHi Priya, thanks for shopping with us. Your invoice is attached.
- Zenspire StoreReset your passwordUse the link below to set a new password. It expires in 30 minutes.
- Zenspire StoreYour monthly statement is readyYour September statement is now available in your account.
What you get with email api & smtp
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Transactional email API
Send order, account and billing emails from your code with templates and dynamic fields.
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SMTP relay
Point your CRM, ERP or website at our SMTP server and keep sending the way you do today.
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Domain authentication
SPF, DKIM and DMARC set up on your domain so mailbox providers trust your emails.
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Templates
Reusable email templates with your branding and placeholders for names, amounts and links.
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Tracking and logs
Delivered, opened, clicked, bounced and complained, for every message and every campaign.
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Bounce and unsubscribe handling
Bad addresses and unsubscribes are suppressed automatically to protect your sender reputation.
How businesses use email api & smtp
Common ways our clients put email api & smtp to work.
E-commerce
Order confirmations, invoices, shipping updates and abandoned cart emails.
SaaS and apps
Sign-up verification, password resets, usage alerts and reports.
Banks and fintech
Statements, payment receipts and account alerts.
Education
Admission letters, fee receipts and course updates.
Healthcare
Appointment confirmations and lab report notifications.
Travel
Tickets, itineraries and booking changes.
See email api & smtp working for a business like yours.
How to get started
From the first call to your first campaign.
- 01
Book a demo
We review the emails you send, your volumes and your current delivery problems.
- 02
Authenticate your domain
We add SPF, DKIM and DMARC records and set up separate streams for transactional and marketing mail.
- 03
Connect
Your developers use the API or switch your SMTP settings. We help with templates and testing.
- 04
Send and monitor
Watch delivery, bounces and complaints, and act before they hurt your sender reputation.
Compliance
Inbox rules, handled
Gmail, Yahoo and other providers now require bulk senders to authenticate their domain and make unsubscribing easy.
- SPF, DKIM and DMARC on your sending domain
- One-click unsubscribe in marketing emails
- Low spam complaint rates, watched in your dashboard
- Automatic suppression of bounced and unsubscribed addresses
API and integrations
Works with your stack
Send through the API or SMTP from any language, framework or platform.
- REST API and SMTP relay
- Webhooks for delivery, open, click, bounce and complaint events
- Works with common CMS, e-commerce and CRM platforms through SMTP
- Sub-accounts for brands, clients or environments
- DLT registeredCommercial SMS in India
- Meta WhatsAppBusiness Partner
More from the CPaaS platform
Every channel runs from the same dashboard and API.
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OTP & Verification SMS
Verify users in seconds. Send one-time passwords over SMS on a transactional route, with WhatsApp and voice as backup when a message is slow.
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Bulk SMS
Reach every mobile phone in India, smartphone or not. Send offers, alerts and reminders from a DLT registered platform, by dashboard or API.
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WhatsApp Business API
Message customers where they already are. Send offers, alerts and support replies on WhatsApp at scale, from one number your whole team can use.
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White Label CPaaS & Reseller
Sell SMS, RCS, WhatsApp API, voice and email to your clients under your own brand. You set the prices and own the relationship. We run the platform.
What is the difference between an email API and SMTP?
Both send email. The API is called from code and gives you more control and data, while SMTP is a standard protocol that almost any software can use by changing its mail settings. You can use both on the same account.
Why are my emails going to spam?
Usually because the domain is not authenticated, the sending IP or domain has a poor reputation, or people mark the emails as spam. We fix the setup with SPF, DKIM and DMARC and help you keep complaint and bounce rates low.
Can I send marketing emails too?
Yes, to people who have opted in. We keep marketing and transactional streams separate so a newsletter never slows down a password reset.
What do Gmail and Yahoo require from bulk senders?
Senders of large volumes must authenticate their domain with SPF, DKIM and DMARC, offer one-click unsubscribe in marketing emails and keep spam complaint rates low. We set this up as part of onboarding.
Do I need a dedicated IP address?
Only at higher, steady volumes. Most businesses do well on a well-managed shared pool. We advise you in the demo based on your volume.
How is the email API priced?
It depends on monthly volume and features. Book a demo and we will share a written quote.
Book a demo
See email api & smtp in a live demo
Pick a 30-minute slot. We show the platform, answer your questions and send a written quote after the call.