Product Updates

What's new in Letterhead

January 2026

Threads in Social Blocks · January 27, 2026

Add Threads to your social profile and social share blocks in the advanced composer—giving your audience another way to follow and share your content where they're already active.

Channel Visibility in Organization Audience · January 21, 2026

A highly requested improvement: organization administrators can now see which channel(s) an audience member is subscribed to directly in the organization audience table. Filter and search to quickly understand subscriber distribution across your portfolio.

Block Library · January 20, 2026

Save any block directly from the composer and reuse it instantly. Saved blocks appear in a new "Library" tab—drag and drop to insert fully configured sections with all content and styles intact. No more rebuilding the same layouts from scratch.

HTML Promotions · January 14, 2026

Revenue and marketing teams can now manage programmatic ads and custom ad tags directly through Company Promotions. Add, schedule, and track external ad tags as a dedicated "HTML" promotion type—using the same workflows you already know. One central place for all revenue streams.

Curate with AI API (beta) · January 2026

For API users: pass a subject to Letterhead and automatically curate relevant articles to specified channels. Note: beta feature, results may vary. Requires v3 API key from company-level settings.

December 2025

Polls · December 2025

Embed customizable polls directly into any newsletter to turn passive reading into active participation. Create polls at the organization level, reuse them across newsletters, and view aggregate response metrics from a single dashboard. Whether you're validating content ideas, testing sentiment, or making newsletters more interactive—polls give you direct reader feedback without leaving the inbox.

Increased Promotion Zones · December 17, 2025

You can now place promotions in up to 10 distinct zones within a newsletter—up from the previous limit of 3. More flexibility for sponsors, more inventory for your revenue team.

Newsletter Edition Metrics: Subscriber Activity · December 2025

See exactly which subscribers opened a newsletter or clicked a specific link—directly from the edition metrics page. Click on the open rate or unique clicks metric to open a modal showing the engaged subscribers. Faster troubleshooting, clearer engagement visibility, no exports required.

Mailchimp Integration · December 2025

Prepare newsletters in Letterhead and send them through Mailchimp—without migrating audiences or changing your existing sending infrastructure. Connect once, keep your workflows, and get Letterhead's production tools on top of Mailchimp's delivery.

WordPress Plugin: Multi-Channel Sync · December 2025

The Letterhead WordPress plugin now supports syncing your WordPress site to one or more channels in your company. Map posts to the right newsletters automatically.

Mobile Font Size & Padding Controls · December 10, 2025

New settings let you set separate font sizes and padding values for mobile screens. Fine-tune readability and visual flow for smartphone and tablet readers without compromising your desktop design.

Revalidate or Reset RSS Feeds · December 2025

Troubleshoot feed issues faster—revalidate or fully reset your RSS feeds with a single click.

Automatic IAB Categorization · December 2, 2025

Curated content now gets automatically tagged with IAB categories based on keywords, domain evaluation, and content fingerprinting. Filter your Curations Library by category to find the right content faster—no manual tagging required.

WordPress Plugin · December 1, 2025

The Letterhead WordPress Integration Plugin is now available. Connect your WordPress site directly to your Letterhead channels, and new or updated posts sync automatically into your Curations Library. Less copy-paste, more publishing.

November 2025

Append Custom UTM Codes · November 24, 2025

Add merge tags as query parameters to all links in a newsletter or template. Link clicks directly to specific users in your CRM or analytics tools—without manual URL editing on every link.

Remove and Anonymize Audience Members · November 21, 2025

Meet GDPR "Right to Be Forgotten" requirements with a single action. Remove an audience member's PII while preserving an anonymized record—your historical metrics stay accurate, your compliance stays airtight.

Export Audience Member Data · November 19, 2025

Download all information about an individual audience member in one click. Supports GDPR "Right to Access" requests without needing to contact support.

New Layout: Product Showcase · November 17, 2025

A new 4-column layout designed for product features, pricing tiers, or comparison grids. Includes space for images, text, and CTA buttons—built for high-engagement newsletter sections.

Hex Color Input · November 13, 2025

Enter hex codes directly into the color picker in the advanced composer. Faster brand-exact color matching, no more hunting through palettes.

Smart Cropping for Curations & RSS · November 5, 2025

Smart cropping is now available on Curation and RSS blocks—including automations. Crop dynamic images with preset ratios (including circle) for more polished, consistent layouts.

October 2025

Activity Log · October 30, 2025

Every subscriber profile now includes a clickable timeline of opens and clicks. Newsletter editors and support teams can see engagement history at a glance, troubleshoot issues in seconds, and take action—like tagging or updating a profile—directly from the log.

Stack Columns on Mobile · October 27, 2025

Multi-column blocks now have an option to stack vertically on mobile screens. Image-left/text-right becomes image-on-top/text-below—giving you granular control over the mobile reading experience.

Smart Cropping for URL & Image Blocks · October 24, 2025

Crop dynamic images in URL and Image blocks using preset ratios, including a new circle option. More control over how images display across your newsletters.

Image Border Radius · October 17, 2025

Apply rounded corners to images throughout the advanced composer—including images, curations, logos, and layouts. Softer edges, more design flexibility.

Extended Block Backgrounds & Layout Spacing · October 10, 2025

New options to extend block background colors to the full width of your newsletter, plus adjustable spacing ("Layout Gap") between social icons and curation elements. Small controls, big visual impact.

A/B Testing for Subject Lines · October 3, 2025

Test subject line variations automatically. Letterhead sends different versions to 25% of your audience, picks the winner based on opens, and sends the best-performing subject to the remaining 75%. Better open rates, zero extra work. (Requires 400+ audience members.)

HubSpot Bi-Directional Sync · October 3, 2025

Connect HubSpot once, map subscription types to Letterhead channels, and keep subscribers synced in both directions—automatically. No more manual exports, list drift, or sync surprises.

Newsletter Edition Metrics Redesign · October 3, 2025

A refreshed metrics view with bar charts for sent/delivered/opens/clicks, a rate table for delivery/open/click/clickthrough percentages, a detailed clicks table by URL, and a dedicated A/B test results section with winner badges.

Auto-Tagging for RSS Feeds · October 3, 2025

Automatically tag new items imported from RSS feeds. Set tags once when adding or editing a feed, and every imported item displays the selected tags in your Curations Library.

September 2025

AI Subject Lines (Smart Subjects) · September 19, 2025

Generate effective, on-brand subject lines and preview text with one click. Letterhead analyzes your newsletter content, themes, and your top-performing past subject lines to suggest options optimized for open rates—avoiding spam triggers and keeping copy concise. Refine or regenerate until it's right.

Global Promotions · September 19, 2025

Centralize sponsored content management for multi-newsletter organizations. Assign promotions to one or many channels, track metrics, and ensure campaign consistency from a single dashboard. Editors insert a Promotion block and the correct content auto-populates—no manual coordination required.

Mobile Preview · September 19, 2025

Preview how your newsletter will appear on mobile screens before you send—available at both Channel and Company levels during the preview step. Catch mobile formatting issues before your audience does.

Email Weight Checker · September 19, 2025

A pre-flight notice warns you if your email is likely to clip in Gmail due to size. Catch oversized emails before they send incomplete.