Postmastery supports SendGrid clients with template for multiple webhook endpoints

Postmastery provides delivery monitoring and optimisation services on top of various email delivery environments. Sometimes we offer this service on top of on-premises MTA (like PowerMTA or EmailSuccess) and sometimes on top of cloud-based ESP’s (like Mailchimp or Smartfocus). A prerequisite of delivery monitoring and optimization services, is to get the right data points like […]

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Categories: Authentication, General, Sendgrid, Solutions

ISP information: Orange.fr

Postmastery assists various senders every day with delivery monitoring tools and consultancy services. In order to assist the global email senders community, we are happy to share some ISP specific information we collected over the last few years. This blog post looks at some more details, this time related to Orange.fr. Orange: the biggest French ESP […]

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Categories: Authentication, General, Providers

New SMTP replies at Outlook: update your backoff patterns to avoid reputation damage

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 […]

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Categories: Authentication, Deliverability, General, Providers