Understanding Email Messaging

The Vonage Messages API Email channel enables you to send emails using the same unified API you already use for SMS, WhatsApp, RCS, and other messaging channels.

This page explains how the Email channel works, what is supported, and the key concepts you need to understand before building with it.

The Email channel focuses on transactional email use cases and includes the following capabilities:

  • Outbound email — plain text & HTML
  • Delivery status webhooks
  • Regional sending (EU, US, APAC)
  • Self-serve domain authentication via Customer Dashboard
  • Domain linking to Vonage Application via Dashboard
  • Logs & Analytics in Customer Dashboard
  • Bounce & complaint management
  • Suppression list management
  • Inbound email via webhook
  • Dedicated IP addresses
  • CC / BCC support

How the Email Channel Works

Email is a native channel within the Vonage Messages API. It uses the same /v1/messages endpoint, JWT authentication model, and webhook delivery pattern as SMS, WhatsApp, and RCS.

Outbound Flow

Your application sends a request to POST /v1/messages with the channel set to email. The Vonage Email Engine delivers the message to the recipient’s mailbox and sends delivery updates to your configured Status URL.

Inbound Flow

A sender emails your verified domain. The domain’s MX record routes the message to Vonage, which identifies the linked domain and sends the event to the Vonage Application’s configured Inbound URL.

Email Integration to Messages API

Email is integrated as a new channel within the existing Messages API model. No new base endpoints are introduced — you use the same /v1/messages endpoint you already use for other channels.

To send an email, set "channel": "email" in your request body. The message_type field accepts "text" for plain text emails and "html" for HTML emails.

Self-Serve Domain Onboarding

Domain authentication is fully self-service through the Vonage Customer Dashboard. Complete the following steps to prepare your domain for email messaging:

  1. Add your domain. In the Customer Dashboard, go to Messages > Email > Domain Authentication and enter the domain you want to use.
  2. Configure DNS records. Add the SPF, DKIM, and DMARC records provided by Vonage through your DNS provider.
  3. Wait for verification. DNS verification can take up to 72 hours.
  4. Link the verified domain. Connect the domain to a Vonage Application to enable webhook routing and inbound email.

Next step: See Getting Started with Email for the complete onboarding and configuration guide.

Inbound Email

The Email channel supports inbound messages sent to a Vonage-verified domain or subdomain. Vonage receives the email and delivers it to the linked Vonage Application through the configured Inbound URL.

Key requirements:

  • Configure Inbound DNS records. Point the inbound domain or subdomain to the Vonage-provided mail servers.
  • Link the domain. Connect the verified domain to a Vonage Application.
  • Set the Inbound URL. Configure the application endpoint that will receive inbound email events.
  • Use a dedicated subdomain. A subdomain such as reply.example.com helps prevent inbound routing from affecting corporate email on the root domain.
  • Handle multi-domain messages. If one email includes recipients across multiple verified domains, Vonage fans out one event per verified-domain recipient. Each event has a different message UUID, a separate CDR, and the complete original recipients array.

Logs & Analytics

The Logs & Analytics area of the Vonage Customer Dashboard provides real-time visibility into email sending and delivery activity.

Customers with Email API access can use the dashboard without additional configuration to review message activity, investigate delivery outcomes, and support operational troubleshooting.

Dedicated IP Addresses

By default, email is sent through the Vonage shared IP pool. High-volume senders on eligible plans can request dedicated IP addresses to isolate sender reputation and gain greater control over deliverability.

Key considerations:

  • Plan entitlement: One dedicated IP is included with the Advanced plan at general availability.
  • Additional capacity: Additional IP addresses are available for a one-time charge of $30 per IP.
  • Warm-up: Vonage does not manages IP warm-up process and customer needs to warm up the dedicated IPs
  • Volume consistency: Dedicated IPs require stable sending volume to build and maintain sender reputation.

Email Use Cases

The Email channel is designed for transactional use cases where a message is triggered by a user action or a system event. Common examples include:

  • Order confirmations and receipts — send a confirmation email immediately after a purchase.
  • Password reset and account verification — deliver time-sensitive security emails reliably.
  • Shipping and delivery notifications — keep customers informed at each stage of fulfilment.
  • Appointment reminders — reduce no-shows with automated reminder emails
  • System alerts and notifications — notify users or internal teams of important events in real time.
  • OTP / Two-Factor Authentication — email as a fallback channel for Vonage Verify.
  • Reply tracking & support ticketing — use inbound email to receive customer replies to your automated emails.
  • Omnichannel failover — configure email as a fallback if WhatsApp or SMS fails using the Messages API failover model.
  • KYC / compliance notifications — deliver identity verification and regulatory documents reliably.
  • Welcome & onboarding sequences — trigger automated onboarding emails from your platform.

Email as Part of Your Omnichannel Stack

Because email is a native channel within the Messages API, you can use it alongside SMS, WhatsApp, and RCS through a consistent API and authentication model.

Example failover workflow:

  1. Start with the preferred channel. Send the initial message through WhatsApp.
  2. Fall back to email. If the WhatsApp message is not delivered within the defined time window, send an email.
  3. Use SMS as the final fallback. If the email bounces, send an SMS notification.

This approach keeps channel coordination within the Messages API and reduces the need to maintain separate vendor integrations.

Further Information