- Send marketing campaigns and transactional messages from the dashboard or API
- Build automated email and multi-channel flows with Journeys
- Design emails using drag-and-drop or HTML
- Personalize content with dynamic fields, conditional logic, and language variants
- Track performance and A/B test with detailed analytics
- Segment your audience for precise targeting
- Integrate with CRMs and tools like HubSpot, Mixpanel, Amplitude, Zapier, and more
Email setup
Before sending emails, follow these setup guides:Authenticate your domain (SPF, DKIM, DMARC) and enable Auto warm-up before sending at scale to protect your sender reputation and inbox placement.
Email setup guide
Verify your sending domain and enable email in OneSignal.
DNS configuration
Automatically configure DNS with one click or complete setup manually.
Senders
Manage from names, from addresses, reply-to addresses, and multiple sending domains.
Email template forwarding
Import existing email templates by forwarding them directly to OneSignal.
Transactional email setup
Trigger emails based on user actions or custom events.
Custom unsubscribe pages
Replace the default unsubscribe page using OneSignal APIs.
Deliverability, reputation, and analytics
Deliverability determines whether your emails reach the inbox or land in spam. OneSignal provides tools and guidance to help you build and maintain a healthy sending reputation.Email deliverability
Understand how inbox placement works and how OneSignal supports it.
Email reputation best practices
Warm domains, manage volume, and avoid spam filters.
Auto warm-up
Automatically ramp sending volume for new domains.
Google Postmaster Tools
Monitor Gmail reputation and delivery signals.
Suppressions
Manage blocked and suppressed email addresses.
Email message reports
Track open, click, and conversion rates.
Email troubleshooting
Diagnose and resolve common delivery issues.
Create a confirmed opt-in journey
Use Tags, Segments, and Journeys to create a confirmed opt-in journey.
Add your own verification links
Learn how to add your own verification links to your emails.
Design your emails
OneSignal supports visual and code-based email creation. Use the drag-and-drop editor for quick campaigns or the HTML editor for full design control. You can also start from a template and customize from there.Drag-and-drop editor
Build emails visually without writing code.
HTML editor
Design fully custom emails using HTML.
Templates
Start from pre-built templates or create and save your own layouts.
Unsubscribe links and headers
Control unsubscribe behavior, headers, and compliance settings.
Message personalization
Personalize content using user data and conditional logic.
Multi-language messaging
Send localized emails in multiple languages.
Email template forwarding
Import existing email templates by forwarding them directly to OneSignal.
Copy template to another app API
Move templates between OneSignal apps.
Send emails
Send messages from the dashboard, automate them with Journeys, or trigger them programmatically via the API.Dashboard
Compose a message quickly within the dashboard.
Send via API
Send messages programmatically using the REST API.
Journeys
Build automated, multi-step, and multi-channel flows.
A/B testing
Test up to 10 message variants to optimize performance.
Send from the dashboard
Select the message channel
Select Create… then choose your message channel. You can also navigate to Messages or Templates to view previous messages.
Choose a composition method
- Start from scratch with the block editor or HTML editor
- Use a pre-built template
Sender
Configure the sender details used for this email:- From name
- From address
- Reply-to address
- Sending domain
Multi-domain sending is supported. See Senders.
email_from_address, email_sender_domain, email_reply_to_address
Subject and preheader
Set a required subject line and optional preheader text. Preheader display varies by inbox provider — not all inboxes show it.- API fields:
email_subjectandemail_preheader - Supports message personalization and multi-language messaging
Tracking and compliance
Link tracking — Enabled by default. Supports multi-link tracking. See Links and Deep linking for details.- API field:
disable_email_click_tracking
- API field:
include_unsubscribed
Delivery schedule and optimization
Choose when the message should start sending.| Option | Description | API field |
|---|---|---|
| Send immediately | Deliver to all recipients now. | — |
| Scheduled | Send at a specific time, up to 30 days in advance. | send_after |
| Auto warm-up | Gradually ramp volume for new or cold domains. | — |
| Option | Description | API field |
|---|---|---|
| Everyone at the same time | All recipients receive the email at once. Best for urgent messages. | — |
| Intelligent Delivery | Sends at the optimal time for each user based on their open and click activity (excludes bot activity). | delayed_option: last-active |
| Custom time per timezone | Sends at a set local time in each user’s timezone. | delayed_option: timezone, delivery_time_of_day |
The “start sending” time determines the audience cutoff. OneSignal evaluates segment membership at that moment — anyone in the audience receives the message, regardless of per-user optimization settings.
Analytics
Track message performance and engagement.Email message reports
Message-level delivery, open rate, and click-through reporting.
Analytics overview
All analytics options available in OneSignal.
Event Streams
Stream push events to your data warehouse or BI tools in real time.
View messages API
Pull message analytics programmatically via the REST API.
FAQ
What’s the difference between marketing and transactional emails?
Marketing emails are campaigns sent to a segment of users, such as promotions or newsletters. Transactional emails are triggered by a user action or event, such as a password reset or order confirmation. See Transactional email setup for configuration details.Why are my emails going to spam?
Common causes include missing DNS authentication (SPF, DKIM, DMARC), sending to unengaged users, or ramping volume too quickly on a new domain. See Email deliverability and Email reputation best practices for guidance.Can I send emails to users who unsubscribed?
Only for compliance or non-marketing messages, such as legal notices. Enable the Send to unsubscribed users option when composing or setinclude_unsubscribed via the API. Using this for marketing emails violates anti-spam regulations.