What's new in Mailcoach.

MCP compatibility and subscriber sorting

Improvements

• Mailcoach’s MCP server now supports OAuth callbacks from Cursor’s web agent and Grok bot.

Fixes

• Subscriber tables now sort the date column correctly across subscribed, unsubscribed, and unconfirmed contacts.

Sending safeguards and editor polish

New

• Mailcoach now shows a persistent warning when a managed sending domain has ownership, DKIM, or Return-Path DNS issues.
• The Markdown editor now uses your browser’s native spellchecker.

Improvements

• Editors now warn when a selected template has no editable content area and explain how to add one, while keeping editing, saving, and previewing available.
• Complex tag-based audience segments now load more efficiently, with safeguards that prevent listings, counts, exports, and campaign preparation from running unbounded database queries.
• Amazon SES configuration sets are now validated before sending, and affected sends are paused after repeated permanent configuration failures.
• Background cleanup work now avoids overlapping runs and limits long-running database queries, reducing unnecessary queue and database load.

Fixes

• Reusable and transactional template previews now display compiled content correctly on first load and after editor updates.
• Automation actions without editors, such as Halt and Unsubscribe, can now be added and saved reliably.
• Emails with minified CSS ID selectors now render correctly instead of being misread as Twig comments.
• Campaign click API responses no longer fail when the associated subscriber has been deleted.
• Concurrent subscriber imports now use isolated temporary directories so they cannot interfere with each other.
• The Amazon SES setup wizard now detects invalid saved credentials and returns you to authentication with a clear error.
• Background jobs and onboarding subscriptions now stay within the correct hosted account context.

More reliable split tests and audience reporting

Fixes

• Split tests now wait until every variant has sent its test emails before starting the observation period, and the displayed results stay aligned with the statistics used to select the winner.
• Email list performance charts now calculate subscriber totals correctly across date ranges, including subscription and unsubscribe activity within the selected period.

Campaign controls and automation reliability

New

• Campaigns can now be paused and resumed from Mailcoach, the API, or a connected AI assistant.
• Date-based automation triggers can now repeat weekly.

Improvements

• Scheduled campaign screens now show the delivery time in your browser’s timezone.

Fixes

• Incomplete nested automation actions can no longer leave an automation partially saved or corrupted.
• Merge tags added through the visual editor no longer insert extra whitespace before punctuation.
• “Sent with Mailcoach” links no longer include an unnecessary slash before tracking parameters.

Campaign editor polish

Fixes

• Campaign content action buttons no longer flicker while saving, and the Preview button remains available.

Campaign draft previews and tracking reliability

New

• Draft campaigns can now generate signed share preview links, so reviewers without Mailcoach access can preview a campaign before it is sent.

Improvements

• Authorized users can now open draft campaign webviews while they are signed in, making it easier to review campaign previews before sending.
• SES open tracking is now placed near the top of campaign and automation emails, improving open tracking reliability for long messages that Gmail may clip.

Fixes

• Subscriber imports now trim extra whitespace around email addresses before validation, preventing valid rows from being rejected because of pasted spacing.

Campaign editing and tracking polish

New

• Campaigns can now be duplicated from a dedicated modal, giving you a clearer flow before creating the copy.

Improvements

• Scheduled campaign screens no longer show a redundant ready notice once the schedule is already clear.
• Pages with hidden navigation are centered more consistently.

Fixes

• Campaign opens can be sorted by email address again.
• A wider range of links now work correctly when UTM tags are added.

AI assistant connections

New

• You can now connect supported AI assistants to Mailcoach.
• Hosted Mailcoach accounts can securely authorize AI assistant connections.
• Authorizing AI assistant connections now uses a dedicated flow separate from the main app.

Improvements

• AI assistant connections now enforce stricter access checks.
• AI assistant login and consent screens keep you in the right team.

Fixes

• AI assistant sign-up and login errors are handled more clearly.
• Account token verification pages load correctly.

Segment, editor, and upload fixes

Improvements

• Segment population now shows a loading placeholder while counts are being prepared.
• Subscriber segments load faster when tags are used.
• Verification emails have clearer wording to improve delivery.

Fixes

• Escaped HTML is preserved correctly in the code editor.
• Segment exclusions keep working when tags are removed.
• Images uploaded in the email editor are stored correctly.
• Saving content is more reliable when related items have changed.
• Transactional sending permissions have been tightened.