Take Full Control of Your Email Marketing
Create, manage, and grow campaigns on a modern, self-hosted email marketing platform. Run it on infrastructure you choose, keep subscriber data under your control, and use the same product whether you are a single team or a multi-client operation.
There are no per-contact or per-email product fees. Capacity depends on your license, infrastructure, and sending provider.
Comprehensive Email Campaign Management
Triggers
Automate workflows based on subscriber behavior including opens, clicks, autoresponder activity, subscriptions, and segment membership. Trigger real-time notifications and chain actions to build multi-stage campaigns.
A/B Testing
Optimize your email performance by testing different subject lines, content, or send times to determine what resonates best with your audience.
Cross-Site Form Embedding
Host subscription forms on external websites, landing pages, and partner sites. Collect subscribers from anywhere while managing everything centrally in Interspire.
Autoresponders
Automate email sequences, including time-based drip campaigns, to consistently nurture leads and engage customers. Set up evergreen campaigns to send to your audience regularly.
Scheduled Sending
Plan your campaigns in advance by scheduling emails to be sent at optimal times for your audience.
Newsletter Archive
Showcase your past newsletters directly on your website to attract new subscribers and build trust.
Send to Multiple Lists at Once
Effortlessly send campaigns to multiple contact lists in one send. The system automatically removes duplicate email addresses before sending.
Advanced List Management
Segmentation
Create targeted segments based on subscriber behavior, demographics, or engagement levels to deliver personalized content. Segment sizes are calculated on demand for fast page loads, and segment membership can automatically trigger workflows and notifications.
Automatic List Hygiene
Automatically remove bounced, unconfirmed, and unsubscribed contacts after a configurable retention period. Suppression rules prevent accidentally re-importing deleted contacts, keeping your lists clean and accurate.
Double Opt-In
Confirm new subscriptions so contacts verify their address before they are fully added.
Custom Fields
Collect and use additional subscriber information to tailor your messaging and improve engagement.
Dynamic Content
Dynamically insert content based on subscriber segments for highly relevant messaging.
Import/Export Tools
Easily manage your contact lists with bulk import and export capabilities. Campaign statistics export just as easily, with opens, clicks, bounces, unsubscribes and forwards available as CSV.
Do Not Mail / Suppression List
Keep suppressed addresses out of every send and stop them being re-imported by accident.
Screenshot of a Segment Built From Membership Fields
“I have been using Interspire to send marketing messages for many years. It’s a wonderful resource, easy-to-use and extremely economical. I’d highly recommend it!
Kurt G.
Email Design
Drag-and-Drop Email Builder
Easily create visually stunning emails with our intuitive drag-and-drop editor. Add text, images, buttons, and social media links without touching a line of code. Perfect for marketers who need professional-looking emails in minutes.
Upload or Import Designs
Already have an email campaign designed? Upload and import your existing email campaign from your computer and get started quickly.
Preheader Text
Add preheader text to control the preview line displayed in subscriber inboxes — on newsletters, autoresponders and saved templates alike. Optimized for consistent rendering across major email clients.
Previews
Confirm your emails look great before sending. Preview your message directly in your web browser or send a test email to yourself for final review across different devices and inboxes.
Advanced HTML Editing
For users who require full control over their email design, access the HTML source directly within the editor. Modify every aspect of your email’s layout and structure to match your exact specifications.
Modern Template Library
Start from bundled templates built to render well across major email clients.
Screenshot of the Drag and Drop Editor
Analytics and Reporting
Real-Time Data
Monitor open rates, click-through rates, and other key metrics in real-time to assess campaign performance.
Custom Reports
Connect your Business Intelligence tool of choice to the on-premise database to generate detailed custom reports tailored to your needs.
Bot Detection
Automated link scanners and security bots can quietly inflate your open and click counts. Interspire tags robotic activity and filters it out of your reports by default, with a one-click toggle to compare filtered and raw numbers, tunable detection thresholds, and a robot column in every export.
Built-In Reporting
Access a range of built-in reports and graphs, providing essential insights without requiring third-party tools.
Privacy
For your subscribers and for you. Choose how much each campaign tracks, and your data is stored securely on your own servers.1
Statistics Retention
Set how long send statistics are kept to control database growth.
Screenshot of the Campaign Statistics Snapshot
Email Tracking Modes and Preferences
Per-Campaign Tracking Modes
Choose how each campaign measures engagement: Off, Minimal (date only), Aggregate (anonymous), Individual (consented), or Individual.
Account and List Defaults
Set a default mode for the account and for each list, then override it per campaign when an audience needs something different.
Tracking Preference Link
Add a link to any message so recipients can stop tracking without unsubscribing. Their choice applies across all their lists with you.
Consent Audit and Retention
Consent changes are audited, tracking history can be cleared, and optional retention windows reduce or delete older tracking detail.
Interspire provides the controls; your organization remains responsible for configuration, disclosures, and legal obligations.
Security
Two-Factor Authentication (2FA)
Enhance account security by enabling 2FA, requiring users to provide two forms of identification before accessing the platform. Works with any RFC-6238 TOTP authenticator app.
Multi-User Access
Allow multiple team members to collaborate within the platform while maintaining secure access to email marketing campaigns.
Fine-Grained Permissions
Control user access with detailed permission settings, ensuring that team members can only access the specific features and data necessary for their role.
Encrypted Custom Fields
Store sensitive subscriber details with AES encryption at rest, field by field, so you protect only what needs protecting. Encrypted fields still support exact-match search and segmentation, and built-in safeguards keep protected values out of exports and merge tags.
Automatic IP Banning
Protect your account from unauthorized access with automatic login failure monitoring and IP banning.
Form Protection
Protect forms with Cloudflare Turnstile and honeypot spam protection to block bots without impacting real users.
Encrypted Database Connections
Connect to your MySQL database over TLS so subscriber data is encrypted in transit as well as at rest — useful when your database runs on a separate or managed host.
White-Label, Client, and Service-Provider Controls
White-Label / Private Label
Replace Interspire branding with your logo, colors, interface text, and system messages. Built for agencies and hosting providers.
Per-User SMTP and Sending Limits
Assign SMTP by user and set hourly, monthly, or total sending limits. Use shared sending, separate infrastructure per account, or require users to bring their own SMTP.
Per-User Templates
Assign templates to a user so they appear only in that account.
System Messages and Account Controls
Publish system messages to users, restrict list creation, and structure accounts for agencies, hosts, and multi-team organizations.
Screenshot of Plan Limits for a User Group
Sending Infrastructure and Deliverability
Choose Your Sending Path
Send through your own mail infrastructure or any compatible SMTP service. Google OAuth is available for Gmail and Google Workspace sending.
Bounce Processing
Process soft and hard bounces automatically so problem addresses stop damaging your sender reputation.
One-Click Unsubscribe
Every message carries the RFC 8058 one-click unsubscribe header plus an unsubscribe link, so mailbox providers can offer unsubscribe from the message itself.
Scalability and Integration
API Access
Integrate with CRMs, e-commerce platforms, and custom applications using a comprehensive XML API. Search subscribers with exact, partial, and wildcard filters. Update custom fields for multiple subscribers in a single batch call. Build powerful integrations with minimal API overhead.
Webhooks
Send real-time notifications about list and subscriber activities, enabling dynamic interactions with your applications.
Multilingual Interface
Set the interface language per user, so international teams can share a single installation while each person works in the language they prefer. Additional languages can be added using standard language files.
High-Volume Sending
Queue and send over 100,000 emails per hour, accommodating the needs of growing businesses and large-scale campaigns. Or use our built-in speed limiter.
Large System Mode
Manage millions of contacts with consistent performance. Large System Mode uses cursor-based navigation instead of traditional pagination, reducing heavy database queries and keeping response times fast at any scale. Enable it with a simple configuration toggle.
Did you say Surveys are Included?
Customizable Surveys
Create and distribute surveys to collect insights directly from your audience, helping in market research and customer satisfaction assessments.
Unsubscribe Surveys
Gather valuable feedback from users who opt out to understand their reasons and improve future campaigns.
Solutions by Industry
Agencies
One install, separate client accounts, your brand. See the agency setup.
Hosting Providers & MSPs
Sell white-label email marketing under your own brand and pricing. See the hosting setup.
Publishers & Media
Run every title from one install without per-subscriber pricing. See the publisher setup.
Associations & Membership
Chapter and team accounts with central oversight of member data. See the association setup.
Universities & Higher Education
Department accounts under central IT, with no per-contact pricing. See the university setup.
Own It Instead of Renting It
Hosted platforms bill you every month and charge more as your list grows. Interspire is software you buy once and run on your own server.
$495, Once
A self-install license with 5 user accounts, unlimited contacts, unlimited emails, unlimited surveys, and white-labeling included. See pricing.
Keeps Working If You Stop Paying
Your first year of updates and support is included. The software keeps running whether or not you renew support.
No Meter on Your List
Grow from 10,000 contacts to a million and the license price stays the same. Capacity depends on your server and sending provider.
More Than a Cheap Mailer
Multiple user accounts, fine-grained permissions, white-labeling, bot-filtered reporting, and privacy tracking controls, from a product that has been in production use for more than 10 years.
- There is an exception if using an optional external editor (e.g. Unlayer) where assets (images) will be stored by the external editor provider ↩︎