Mailchimp Launches SMS API Update and Advanced Automation Segmentation.

Mailchimp announced three product updates designed to streamline SMS management and improve automation targeting capabilities for marketing teams.

The updates, announced on LinkedIn, include an enhanced API for SMS contact management, advanced segmentation in automation flows, and upgraded audience analytics.

The updated API allows businesses to add and manage SMS contacts without requiring an email address, a significant shift for companies that collect phone numbers through retail checkout, in-store promotions, or mobile-first channels. Previously, Mailchimp's contact management system required email addresses as the primary identifier.

The API enhancement also includes capabilities for segmentation, targeting, and analysis of SMS-only contacts. This builds on Mailchimp's recent SMS expansion, following their multi-country SMS capabilities launched earlier this year.

Developers can now integrate SMS contacts directly into existing systems, then use Mailchimp's segmentation tools to build targeted audiences based on engagement patterns, purchase history, or demographic data, even when email isn't part of the customer record.

The second update introduces advanced segmentation within automation flows, giving marketers granular control over timing and targeting in automated campaigns. Where previous flow segmentation required separate automation journeys for different audience segments, the new capability allows dynamic branching within a single flow.

This means a single abandoned cart automation could now branch based on cart value, previous purchase behavior, or engagement history, delivering different follow-up sequences to high-value customers versus first-time browsers. The update aims to reduce the complexity of managing multiple parallel automations while improving relevance.

The third update expands audience analytics with deeper insights into subscriber acquisition and growth patterns. The enhanced analytics dashboard now surfaces data on which channels, campaigns, or signup forms generate the highest-quality subscribers based on engagement and conversion metrics.

Rather than simply tracking list growth, the new analytics layer helps teams identify which acquisition sources produce subscribers who actually open emails, click through, and purchase. This data can inform budget allocation decisions and help marketing teams double down on high-performing channels.

For content creators and ecommerce businesses managing multiple signup sources, from in-store tablets to social media ads to website popups, these insights provide a clearer picture of which investments drive sustainable audience growth.

Mailchimp described the features as coming "soon" without specifying exact release dates. The company has been steadily expanding its SMS capabilities throughout 2024, including enhanced Shopify integration and SMS analytics improvements earlier this year.

The updates reflect broader industry trends toward multi-channel marketing strategies that combine email, SMS, and automation. As SMS open rates consistently outperform email, platforms like Klaviyo and Attentive have built businesses around SMS-first marketing. Mailchimp's enhancements suggest the platform is positioning SMS as a core channel rather than an email supplement.

Businesses interested in the new features can visit Mailchimp.com for updates on availability.