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Email / Industry Updates

An Update on Port25 and the Future of PowerMTA - One Year Later​

The following is written by Juan Altmayer Pizzorno, the original author of PowerMTA. Pizzorno has been developing email server software for over 25 years and currently serves as Sr. VP of Research & Development at SparkPost. He co-founded and was CTO of Port25 Solutions. more»

Encrypting Inbound and Outbound Email Connections with PowerMTA

Encryption is becoming increasingly necessary when transferring data across the internet, and email is no different. In PowerMTA 4.5 and later there are several methods to encrypt both inbound and outbound connections. Here we'll provide a quick overview of how they may be achieved. Keep in mind, this document only deals with encrypting the channel, not the content. more»

V12 Group Sustains Customer Satisfaction by Deploying PowerMTA for Launchpad Platform

With more than 8,000 platform users, 85 percent of which are brand-name retailers, reaching out to 110M US households, V12 needed an MTA (Messaging Transfer Agent) that would execute high delivery rates, offer more control, and easily enable the latest authentication protocols. more»

PowerMTA Now Offers Scheduled Delivery Control

In PowerMTA v4.5 and later versions messages can now be scheduled for delivery. The feature allows for scheduling multiple delivery windows. more»

DKIM for ESPs: The Struggle of Living Up to the Ideal

Given the increase in email fraud (phishing) and an increasingly complex email landscape, it is increasingly important for email service providers to implement email authentication properly. more»

Reactivation Campaign: Shared vs. Dedicated IPs

Within the digital messaging industry, an opportunity will sometimes arise for an email marketing manager to send a re-activation campaign to dormant email addresses, in order to galvanize subscribers who don't respond to your messaging. more»

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»