List-Unsubscribe header critical for sustained email delivery

In our daily work, we still encounter missing List-Unsubscribe headers in emails. Reason enough to publish another BLOG post on this important topic. Specially for PowerMTA users, we released an interesting add-on to streamline MAILTO unsubscribe requests. What is a List-Unsubscribe header? When subscribers want to unsubscribe from a mailing list and the unsubscribe process […]

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Categories: Case Studies, General, PowerMTA

Case study – Why typo domains can cause severe email delivery issues

In our daily email delivery monitoring activities, we recently saw the damage that typo domains can do. In this case study, simple typos in domains caused severe email delivery issues. We will recap what happened and how we solved the issue. Hopefully, other senders can avoid this kind of situation in the future. Postmastery, we […]

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Categories: Case Studies, Deliverability, PowerMTA

Happy client: SuccessByEmail.com

“I would like to thank the PowerMTA email delivery experts at Postmastery. Postmastery was incredibly responsive to our specific delivery needs and wasted no time in taking a scientific approach to identify specific issues and formulate a path to resolution. From precise data collection and analysis to resolution recommendations and follow up, Postmastery does a […]

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Categories: Case Studies