---
title: "Changelog - March, 2025"
description: "Developer documentation for Topol's embeddable white-label email editor and landing page editor (beta). Get practical insights and guidance for integration and optimized user experiences."
url: https://docs.topol.io/changelog/2025-03.html
---

# Changelog - March, 2025

## New Features

Email Performance

### Lambda Region

**The Lambda Region setting picks the AWS region where the Plugin's serverless functions run.** The choice is between Frankfurt (eu-central-1) and Northern Virginia (us-east-1), and it determines where the backend logic executes.

The nearest region means fewer network round-trips, so templates render faster and API calls complete with lower latency. A European data center also simplifies GDPR and other data-residency compliance, while the U.S. region suits North American workloads.

Add or update the `lambdaRegion` key in `TOPOL_OPTIONS`. Left unset, it defaults to `eu-central-1`:

```ts
  lambdaRegion: "eu-central-1", // "eu-central-1" for Frankfurt
                                // "us-east-1" for N. Virginia
```

For full configuration details, see the [documentation](https://docs.topol.io/email-editor/guide/lambda-region.html).

Email UX/UI

### Hover Preview for Saved Blocks

**Hovering over a saved block's thumbnail in the Premade Blocks panel now shows an instant preview.** A lightweight pop-up renders the block in full, content and layout included, with no need to drag it onto the canvas first.

Inspecting a block's real appearance before insertion removes the guesswork. Designers can scan dozens of saved components and spot the right header, footer, or call-to-action without cluttering the editor.

## Improvements

Email Config

### New Configuration Option for Merge Tags

Calling `window.TopolPlugin.setMergeTags(yourMergeTagsArray)` now swaps the default merge-tag sets at runtime, loading different tag groups without rebuilding the plugin. For full details, see the [documentation](https://docs.topol.io/email-editor/guide/merge-tags.html#update-merge-tags).

Email UX/UI

### Replaced Missing Images in Premade Templates

Several premade templates showed broken or missing images. As a temporary measure, a universal placeholder now fills in for every missing asset. A full review of the Premade Templates is underway for a permanent fix.

Email Blocks UX/UI

### Improved Border-radius Settings

A Content Block's border-radius can now take a single value applied to all four corners, or a separate value per corner (top-left, top-right, bottom-right, bottom-left) for custom shapes.

Email Blocks UX/UI

### Inner vs. Outer Column Offsets

A column's offset can now apply inside its own padding (inner offset) or outside its container (outer offset), giving precise control over how columns shift relative to their content and neighboring blocks.

## Bugfixes

-   Email Fixed an issue where removing the link from a Video block left an empty, zero-dimension placeholder in the template.
-   Email Resolved a bug where deleting the text label of a Button block collapsed it to zero dimensions while it remained in the template.
-   Email Resolved an issue where HTML conditional comments inside an HTML Block were incorrectly flagged as invalid code.