Email / Industry Updates

To Where are Bounce Messages Sent?

This seems to be one of the greatest mysteries to new postmasters. It can be confusing as the messages go to the SMTP MAIL FROM address, which can be different from, or the same as the from header. The key to understanding bounces (sometimes referred to as DSNs, Delivery Status Notifications or NDRs, Non-Delivery Reports) is that they should always be sent to the SMTP MAIL FROM address. Some mail platforms may not adhere to this rule, but most do. more»

An Open Source Perspective on Commercial MTAs

It's always refreshing to obtain a different perspective, especially from the open-source community regarding email sending infrastructure. For those who are currently utilizing an open-source product, we thought this feedback from one of our constituents would be valuable for decision makers. more»

Five Essential PowerMTA Configuration Tips

When asked what are the best configurations to use with PowerMTA? The answer is different for every region of the world. Configuration settings in the US will be vastly different than those in Europe for example, so global settings are not as effective. more»

What's New With Port25's PowerMTA v4.5

Port24 recently intruded PowerMTA v4.5 as a major new release of PowerMTA. It now includes a wide variety of new advanced features and functionalities that allow for greater flexibility and delivery control to help maximize overall performance and deliverability. more»

New Feature in PowerMTA v4.5: IP Based Rate Limiting

One feature in PowerMTA's GA release of v4.5 is IP based Rate Limiting. The "source-ip-max-msg-rate" is specifically designed to give delivery engineers/admins additional control. more»

Case Study: Emergency Response Systems Rely on Timely Messaging Through PowerMTA

Boasting delivery rates of over 5MM messages per hour, eAlert from MIS Sciences is United States' leading emergency alert notification system. An extremely reliable and flexible system was key for handling the delivery of several million high-priority messages each day. more»

Port25 Announces Next Major Release of Its Email Delivery Solution, PowerMTA

Port25 separates itself further from the competition with the release of PowerMTA v4.5, and one of the noteworthy options in this release is Scheduled Delivery Control. more»

Case Study: How PowerMTA Transparent Deliverability Metrics Paves Way for Email Service Provider

Communicator Corporation is an ESP with a different approach to email delivery. Unlike other ESPs, they allow each client to take ownership of their deliverability, which helps clients understand and appreciate that delivery is not just something for which their ESP is responsible. more»

Case Study: MailChimp Achieves Efficient Execution and Reliability with PowerMTA

With over 5 million users, and delivering over 16 billion emails per month, MailChimp is one of the most highly regarded Email Service Providers, especially among those focused on small and medium sized businesses. more»

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

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. more»