Email deliverability changed significantly between 2024 and 2025 as mailbox providers tightened their requirements for bulk senders.
 
In 2024, Google and Yahoo introduced a 0.3% spam complaint threshold and expanded AI-based email analysis. A year later, Microsoft adopted the same spam rate standard, implemented AI-driven filtering, and made DMARC mandatory for bulk senders.
 
These updates raised a practical question for senders: how did they affect email deliverability?
 
This free PDF analyzes changes in email deliverability between 2024 and 2025 using testing data from GlockApps client campaigns. The analysis is based on thousands of deliverability tests conducted across both years and focuses on measurable differences in inbox placement.
 
What’s Inside the Report?
 

• Deliverability rates per ESPs (who increased the Inbox rate, who dropped it)
• Deliverability rates per Inbox Providers (who delivered more emails in Inbox in 2025)
• Deliverability rates per monthly volume (does the volume still matter?)
   
  When inbox placement changes, it’s not always obvious what caused it. The data in this report provides a reference point by showing how deliverability has changed across the industry since the new sender requirements were introduced, and gives you a basis for further actions in your email strategy.
   
  See how your results compare in the full report 👉