Home / Industry

Case Study: Emma Swaps Its SMTP Infrastructure for PowerMTA to Handle Growing Mail Volume

Over the years, email service provider Emma has experienced 35% annual growth in email volume from its new and existing clients. Emma’s services include email automation, audience segmentation, mobile email marketing, and integration with CRM solutions, eCommerce platforms, and social networks. Emma has developed an innovative Event-Driven Architecture (EDA) with sophisticated messaging features—from data-driven insights, to email automation—rapidly and without service interruptions. The EDA architecture gives marketers real-time insights, allowing them to personalize each customer’s experience.

The Challenge

A major obstacle that drove Emma to consider PowerMTA was an expected forthcoming collision between mail volumes that had risen to 375M messages/ month, and its 10-year-old, home-grown PHP-based system. The technology had reached the end of its scalability, being cumbersome to configure, and lacking deployment features and sophisticated delivery controls. Emma urgently needed a better solution to manage the growing volume, one that would include the capacity to add smarthooks at minimal cost.

Key features of the old system were either missing or difficult to use, such as retry back-offs, rate limiting, DKIM, and the ability to react proactively to SMTP reply responses. As the company grew, it would be expensive, awkward, and risky to scale the aging technology—it was clearly time for a replacement.


Emma now uses PowerMTA to manage its increasing mail volume efficiently, with a minimal investment while allowing it to scale its business exponentially, without bottlenecks or unreasonable expense.

Emma’s system administrators were drawn to PowerMTA’s flexible logging schematics, as well as its easy-to-configure VirtualMTA pools, ability to configure retry and total time in queue, and the ability to send large volumes of mail using modest hardware.

Emma’s digital messaging volume currently averages 1.5M hourly, 12M daily, and 375M monthly, expected to double in the relative near-term, consistent with industry forecasts.

By Port25, A Message Systems Company

Port25, A Message Systems Company, provides highly focused email delivery software that addresses the ever-expanding needs of client communications and digital messaging apps. Port25’s flagship product, PowerMTA™, has a global footprint, with over 4,000 installations in more than 51 countries.

Visit Page

Filed Under


Commenting is not available in this channel entry.
CircleID Newsletter The Weekly Wrap

More and more professionals are choosing to publish critical posts on CircleID from all corners of the Internet industry. If you find it hard to keep up daily, consider subscribing to our weekly digest. We will provide you a convenient summary report once a week sent directly to your inbox. It's a quick and easy read.

I make a point of reading CircleID. There is no getting around the utility of knowing what thoughtful people are thinking and saying about our industry.

Co-designer of the TCP/IP Protocols & the Architecture of the Internet



New TLDs

Sponsored byRadix

Brand Protection

Sponsored byCSC

Domain Names

Sponsored byVerisign

IPv4 Markets

Sponsored byIPv4.Global

Threat Intelligence

Sponsored byWhoisXML API


Sponsored byVerisign