It has been almost a year since we covered Interspire Email Marketer v8.6.0, which introduced unsubscribe surveys and per-user multilingual support. Since then, Interspire has been busy. Four major releases have shipped, bringing dozens of features spanning form security, API enhancements, infrastructure hardening, and powerful new automation capabilities. This post covers the highlights across v8.7.0 (July 2025), v8.7.1 (October 2025), v8.7.2 (December 2025), and v8.7.3 (February 2026).
We also have some news on the IEM Addons front: our Advanced Triggers addon has been discontinued, and the reason is a good one. Read on for the full story.
v8.7.0:Form Security & Modern UI (July 2025)
The v8.7.0 release focused on tightening up form security and modernizing the user interface.
Cloudflare Turnstile CAPTCHA
Interspire now supports Cloudflare Turnstile as a privacy-first CAPTCHA solution. Unlike traditional CAPTCHAs that rely on invasive tracking or frustrating image puzzles, Turnstile runs invisibly in the background, blocking bots without degrading the subscriber experience. If you have been fighting form spam, this is a significant upgrade over legacy options.
Honeypot Spam Protection
Alongside Turnstile, a new honeypot protection layer is available. This invisible technique catches automated bots by presenting hidden form fields that real users never see. You can use it as an alternative to CAPTCHA or as a complementary layer for defense in depth.
Cross-Site Form Embedding
Forms can now be embedded and hosted on external websites, making it easier to collect subscribers from landing pages, partner sites, or anywhere outside your Interspire installation.
Performance & UI Improvements
Several under-the-hood improvements round out this release:
- Automatic statistics cleanup: configure retention periods to keep your database lean over time.
- On-demand segment calculation: segment sizes are no longer computed on every page load, resulting in noticeably snappier navigation.
- ApexCharts migration: the charting library has been replaced with ApexCharts, delivering smoother interactions and a cleaner visual palette.
- Refreshed form templates: built-in form designs have been updated with cleaner, more responsive layouts.
- Enhanced newsletter spam checking with updated rules, and revised email client compatibility checks to catch rendering differences before you hit send.
v8.7.1:API Power & List Hygiene (October 2025)
The v8.7.1 release is a developer-focused update that strengthens the API and adds list hygiene automation.
New API Search Filters
The subscriber retrieval API now supports four search filter types: exact, includes, start_with, and end_with. These give integrators much more precise control when querying subscriber data, useful for CRM syncs, data lookups, and building custom dashboards.
Batch Custom Field Updates
A new savesubscribercustomfields API method enables updating multiple custom field values for multiple subscribers in a single call. If you are synchronizing subscriber data from an e-commerce platform or CRM, this dramatically reduces the number of API calls required.
Auto-Delete Unsubscribers with Suppression
Interspire already supported automatic cleanup of bounced and unconfirmed contacts. v8.7.1 extends this to unsubscribed contacts as well, with a configurable retention period. Crucially, a new suppression option prevents accidentally re-importing deleted contacts, ensuring your list stays clean even when processing bulk imports.
Under the hood, performance indexes for statistics and trigger tables were added, and bounce categorization received further improvements.
v8.7.2:Infrastructure & Security (December 2025)
The v8.7.2 release is all about hardening infrastructure and addressing real-world deployment scenarios.
RSS Feed Security
RSS feeds are now disabled by default. Previously, feeds could unintentionally expose archived newsletters to the public. Administrators must now explicitly enable feeds in security settings, a sensible default that aligns with the principle of least privilege.
Proxy Header Support
For installations behind reverse proxies or load balancers, Interspire now supports the X-Forwarded-For header to correctly identify source IP addresses. This is essential for accurate IP-based tracking, rate limiting, and ban enforcement in infrastructure setups where the server does not see the real client IP directly. The feature is disabled by default and requires manual configuration.
IPv6 Support
All database tables and IP validation logic have been updated to support IPv6 addresses. As more networks adopt IPv6, this ensures Interspire accurately tracks and validates subscriber and administrator activity regardless of IP version.
Performance & Bug Fixes
Open-tracking SQL queries were optimized to reduce database load, and bounce processing was streamlined to minimize redundant IMAP operations during OAuth-based bounce handling. Preheader rendering was improved for better compatibility with iOS and Outlook. Several bug fixes addressed duplicate RSS entries, PHP 8 dynamic property deprecation warnings, and IP banning edge cases.
v8.7.3:Automation & Scale (February 2026)
The v8.7.3 release is the most impactful of the four, introducing powerful automation triggers and a new mode for managing millions of contacts.
New Automation Trigger Types
This is the headline feature. Interspire has added several new trigger types that significantly expand what you can automate:
- Autoresponder Opened: fire a trigger when a contact opens a specific autoresponder email.
- Autoresponder Link Clicked: activate triggers based on link clicks within autoresponder messages.
- Subscription to Contact List: trigger actions when someone subscribes to a specific list.
- Subscription to Segment: activate when contacts qualify for a particular segment.
- List Owner Notification: a new action that notifies list owners when triggers fire, including details about which trigger activated, the subscriber email, and the associated list or segment.
These triggers enable sophisticated multi-stage automation sequences. For example, you could send different follow-up content based on whether a subscriber opened or clicked an autoresponder, automatically add new subscribers to related lists, or alert a list owner in real time when a VIP contact engages. For a detailed walkthrough, see the Interspire post on expanded possibilities with new automation triggers.
A note on our Advanced Triggers addon: If these capabilities sound familiar, they should. Our Advanced Triggers addon offered exactly these features: autoresponder open/click triggers, list and segment subscription triggers, and contact date field triggers. With v8.7.3, Interspire has integrated all of this (and more, with the addition of owner notifications) directly into the core platform. We have officially discontinued the addon. This is a validation of the need we identified, and more importantly, it means every Interspire user now gets these automation capabilities out of the box, no addon required.
Large System Mode
For installations managing millions of contacts, Interspire has introduced Large System Mode. This replaces traditional page-number pagination with cursor-based navigation, eliminating expensive COUNT(*) queries that cause timeouts on large databases.
Enabling it is simple. Add a single line to your configuration file:
define('LARGE_SYSTEM_MODE', true);
No schema changes or restarts are required. The interface changes from numbered page buttons to Previous/Next navigation, but all other features (filtering, search, bulk actions, exports) work identically. The trade-off is that you can no longer jump to arbitrary page numbers, but query performance becomes constant regardless of database size (O(1) instead of O(n)).
Additional Improvements
A new subscriber count maintenance task automatically corrects statistical drift in list counts over time. Bug fixes addressed duplicate autoresponder trigger execution, MySQL 8 list copy issues, and language file validation.
The Bigger Picture
Looking across all four releases, a clear theme emerges: maturation. Interspire is systematically hardening security (Turnstile, honeypot, RSS defaults, proxy headers), improving performance at scale (on-demand segments, query optimization, Large System Mode), modernizing the frontend (ApexCharts, Alpine.js updates, refreshed templates), and expanding API capabilities for integrators.
PHP 8.4 readiness has been a multi-release effort spanning v8.7.0 through v8.7.2, addressing dynamic property deprecations and other compatibility concerns.
The automation triggers in v8.7.3 are perhaps the most significant signal. They show Interspire actively investing in competing with modern ESPs on workflow capabilities, bringing features that previously required third-party addons into the core platform.
What This Means for IEM Addons Users and What is Next
Advanced Triggers addon: Officially discontinued. The functionality has been surpassed by the native Interspire implementation in v8.7.3.
The following four addons have been updated and are compatible with v8.5.x:
We are currently evaluating the rest of our addon catalog to determine which addons to update and make compatible with v8.7 and beyond.
If you are still running an older version of Interspire, we strongly encourage upgrading to v8.7.3 to take advantage of the security improvements, performance gains, and native automation features.
Next up: a closer look at the updates to these four addons, followed by a detailed look at our completely redesigned Re-engagement addon. Stay tuned.
The full release notes for Interspire Email Marketer are available on the Interspire release notes page.
Have questions? Get in touch. We are happy to help.