Email Deliverability Insights, Tips & Monitoring Strategies
Introducing The Postmastery Global Email Deliverability Benchmark Report: A Game-Changer For The Email Industry
2023/09/28 by Willem Stam.
We at Postmastery are excited to announce that we are in the process of creating our first-ever Global Deliverability Benchmark Report. By establishing such a report, we aim to assist our clients in Performance Benchmarking and Optimisation as well as Strategy Development. As the creators of this benchmark report, we plan to aggregate data from […]
Categories: Deliverability, General
Improve Email Delivery with PowerMTA’s Defer-Job Setting
2023/04/14 by Alex Irimia.
Email delivery is a critical aspect of any business’s communication strategy. However, maintaining a good reputation for your email delivery IP can be a challenge, especially when using a shared IP with multiple customers. In such a scenario, the actions of one customer with a low reputation can adversely affect the entire queue, causing delays […]
Categories: Authentication, Deliverability, General, PowerMTA
Postmastery joins Signal Spam
2023/02/20 by Willem Stam.
Postmastery is becoming a member of Signal Spam to ensure our clients have maximum visibility into reputational threats and complaints emanating from the french eco-system. Signal Spam is a non-profit organisation dedicated to fighting against electronic messaging abuse, including spam, phishing, and malicious email content. It was founded in 2005 and is based in Paris, […]
Categories: Authentication, Deliverability, General
Warming sender reputation fast and getting it right!
2023/01/10 by Maarten Oelering.
Warming IP and domain reputation does not need to take months – there are many things you can do to speed up the process. Even a large enterprise sender can warm a range of IPs and domains in weeks. Proper preparation, planning and tools are essential to warm up your sender reputation. Enterprise senders often […]
Categories: Case Studies, Deliverability, General
PowerMTA & Managed Deliverability
2020/11/24 by Willem Stam.
Client case: MailPoet MailPoet was founded in 2011 in France with a simple mission: allow thousands of WordPress website owners to create and send emails from the comfort of their WordPress admin. MailPoet built a simple, intuitive, and rock solid solution to deliver their users’ emails on time, every time. Below you can read more […]
Categories: Case Studies, Deliverability, General, PowerMTA
Delivery issues at LaPoste.net resolved
2018/04/10 by Willem Stam.
On Friday April 6, 2018, Postmastery’s Email Delivery Analytics detected serious delivery issues at LaPoste.net. The most frequent SMTP errors we detected were: 421 4.3.2 No system resources 421 4.3.2 All server ports are busy 451 4.7.1 Service unavailable – try again later 421 4.7.0 lpn-prd-vrin0xx Error: too many errors 421 4.4.2 lpn-prd-vrin0xx Error: timeout […]
Categories: Deliverability, General, Providers
New SMTP replies at Outlook: update your backoff patterns to avoid reputation damage
2018/04/06 by Willem Stam.
On April 5th, at 5AM CET, we were alerted by a huge spike in Outlook deferrals. The chart below (copied from Postmastery Delivery Analytics) reveals the deferrals over time: After investigating the issue, Postmastery delivery engineers discovered new SMTP replies at Microsoft domains. These errors are receiver’s side, not related to sender’s reputation. Organization queue quota […]
Categories: Authentication, Deliverability, General, Providers