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Email API & SMTP

Every email.
Delivered with purpose.

Send transactional emails reliably at scale—order confirmations, account alerts, password resets and automated sequences—with full delivery visibility.

Explore the conversation ↓
Transactional deliveryDomain authenticationDelivery analytics

One message.
A useful next step.

A considered message, a natural reply and a clear handoff. Explore three ways the platform can support your business.

Message workspaceLocal preview

Transactional email

Make the message
feel considered.

Messageorder_confirm
Message body

Hi Alex, your order NL-2048 has been confirmed. We'll send tracking details as soon as your package is dispatched.

Transactional emails are triggered by user actions, sent immediately and not subject to marketing opt-out.

NorthlineIllustrative business
Conversation preview

Hi Alex, your order NL-2048 has been confirmed. We'll send tracking details as soon as your package is dispatched.

10:24

I haven't received my confirmation.

10:25

A resend has been triggered. Please check your inbox and spam folder.

10:25
Context ready for your team

No phone number, account or live message is connected.

Keep the conversation.
Carry the context.

A shared inbox and connected tools give people a useful place to step in. Automation supports the handoff.

Alex / Customer enquiry
Customer

I’d like to discuss a new project. Can your team help?

Prepared context

A conversation with a next step.

Interest
New project enquiry
Source
WhatsApp conversation
Next action
Team review

Context attached.Ready for the team.

Messaging starts
with the foundations.

Account setup, useful message design and the right integration. The scope follows your business and your tools.

Email Delivery Platform
Domain authentication setup

Configure SPF, DKIM and DMARC records for your sending domain. Proper authentication improves deliverability and protects your brand from spoofing.

API & SMTP integration

Connect your application via REST API, SMTP relay or SDK. We agree the integration pattern, authentication method and initial volume plan with your team.

Transactional template design

Design clean, accessible email templates—order confirmations, alerts, receipts—that match your brand and render well across major email clients.

Deliverability tuning

Monitor inbox placement, sender reputation and bounce rates. Address issues with IP warming, list hygiene and suppression management before they affect delivery.

Bounce & complaint handling

Process hard bounces, soft bounces and spam complaints automatically. Keep your list clean and protect your sender reputation without manual intervention.

Tracking & analytics

Measure delivery, open and click rates at message and template level. Use the data to identify deliverability issues and refine template performance.

Different businesses.
Useful conversations.

Design the journey around the people you serve and the work your team needs to do.

Order confirmations, shipment updates and a straightforward route to product support.

A considered route
to going live.

Set the foundation.

Review your use case, account, number and onboarding requirements.

Connect the workflow.

Prepare messages, integrations and the handoff your team needs.

Test, then launch.

Validate the flow, check access and agree ownership before activation.

What is Email API & SMTP?

A transactional email API is a cloud-based service that allows applications to send individual, triggered emails programmatically — such as a purchase receipt when an order is placed, a reset link when a password is forgotten, or an alert when a threshold is crossed. Unlike bulk marketing email, transactional email is one-to-one, time-sensitive and expected by the recipient, which means inbox placement rates are typically high when the sending infrastructure is set up correctly.

What you get

REST API & SMTP Relay

Send via REST API for custom apps or SMTP relay for existing systems with no code changes.

Domain Authentication

SPF, DKIM and DMARC configuration ensures your emails are authenticated and trusted.

Real-Time Analytics

Track delivery, opens, clicks, bounces and spam reports for every send.

Template Engine

Build reusable HTML email templates with variable substitution for personalisation.

Bounce & Complaint Handling

Automatic suppression of hard bounces and spam complaints to protect sender reputation.

Dedicated IP Option

Dedicated sending IP for high-volume senders who need maximum inbox placement control.

How businesses use it

SaaS ApplicationsUser signup confirmation, password reset, usage reports and account alerts.
E-commerceOrder confirmation, dispatch notification, return confirmation and review requests.
Finance & FintechTransaction receipts, account statements, fraud alerts and KYC document requests.
Healthcare PlatformsAppointment confirmations, patient portal invites and test result notifications.

How to get started

01

Set Up Domain

Authenticate your sending domain with SPF, DKIM and DMARC — we walk you through it.

02

Integrate the API

Add the REST API or SMTP settings to your app — takes under 30 minutes.

03

Monitor & Optimise

Use the dashboard to track delivery rates and act on any reputation signals.

Clear answers.
Before we connect.

What is the difference between transactional and marketing email?

Transactional emails are triggered by a specific user action (an order, a login, a reset) and are not subject to marketing opt-out laws in most markets. Marketing emails require explicit consent and unsubscribe handling.

Which email service provider do you use?

Provider selection depends on your volume, integration requirements and budget. We evaluate options — including Brevo, Postmark, AWS SES and others — and recommend the best fit for your setup.

How do we improve deliverability?

Deliverability depends on domain authentication, sender reputation, list hygiene and content. We address each during setup and provide guidance on ongoing management.

Can you migrate our existing templates?

Yes. We review existing templates, update them to current standards and ensure they render correctly across the major email clients before migration.

Will this demonstration send an email?

No. The scenarios, inbox preview and enquiry form are local previews. Live sending requires a configured account, authenticated domain and an agreed integration.

Make your next conversation
work better.

Tell us what you need

Let's connect.

Write a project brief ↗