Definition
Dynamic template blocks are reusable sections within an email template whose content changes based on data about the recipient, the segment they belong to, or the automation branch they are in. Where a static template shows the same block to everyone, a dynamic block can show one headline to a new subscriber, another to a loyal customer, and a third to an inactive one.
Dynamic blocks combine a template's visual layout with logic, letting teams run highly personalised emails from a single design rather than duplicating the whole email for each audience.
How Dynamic Blocks Work
| Condition | Block Content Shown |
|---|---|
| New subscriber | Welcome headline and onboarding CTA |
| Active, high-value customer | Personalised recommendations and loyalty offer |
| Inactive subscriber | Re-engagement message with incentive |
| Cross-sell opportunity | Related product block |
| Geo- or language-filter | Localised text per recipient |
The condition is typically evaluated from a merge field, a segment, or a trigger value, and the matching block renders while others are hidden.
Example of an If/Else Dynamic Block
Most ESPs provide either visual conditionals or code snippets. A pseudo-code example:
{{#if segment = "loyal"}}
{{> blockLoyaltyOffer}}
{{else if segment = "new"}}
{{> blockWelcome}}
{{else}}
{{> blockGeneric}}
{{/if}}
The template stays one file, while different recipients receive different blocks.
How to Use Dynamic Blocks Well
- Keep the base layout stable: Vary the content, not the structure, so all recipients experience a consistent brand email.
- Define fallback content: Always provide a default block for recipients who match none of the conditions.
- Test every branch: Render each variant and confirm the correct block displays for the matching data.
- Do not overload with logic: Too many branches become hard to maintain and test; use as few as genuinely add value.
- Check data availability: A block dependent on a missing merge field needs a thoughtful fallback.
Related Glossary Terms
Abandoned Cart Email
An abandoned cart email is a triggered message sent to online shoppers who added items to their cart but did not complete the purchase.
Abandoned Cart Email
An abandoned cart email is an automated message sent to customers who added items to their online shopping cart but left without completing the purchase. It is one of the highest-converting email types in ecommerce.
Back-in-Stock Email
A back-in-stock email is a triggered message sent to shoppers who requested notification when an unavailable product becomes available again.
Batch Sending
Batch sending is the practice of delivering a single email campaign to a large list in groups or waves rather than all at once.
Behavioral Email
Behavioral email is a message triggered by a subscriber's action, inaction, or engagement pattern, making it more relevant than scheduled broadcast sends.
Email Campaign Orchestration
Email campaign orchestration is the coordination of multiple emails, channels, messages and timing into a unified customer experience.
Frequently Asked Questions
A dynamic block is a section of an email template that swaps its content based on recipient data, segment or automation branch. The layout stays the same while different subscribers see different content within that section.
Static content is identical for every recipient. Dynamic content changes conditionally, so the same template delivers a personalised message to different audiences without needing a separate email for each one.
Common examples include a welcome headline for new subscribers, personalised product recommendations for active customers, incentive-based re-engagement offers for inactive users, and localised text based on geolocation or language.
Most email platforms offer visual content blocks with conditional rules, or template variables with if/else logic in code. You define the conditions, provide content for each outcome, and set a fallback for recipients who match none of them.