Email Deliverability Statistics: Significant Changes for Gmail and Outlook in Q3 2025
Estimated reading time: 4 minutes
We continue the analysis of the tests made in GlockApps, and we are ready to present the statistics for Quarter 3 2025. How did deliverability change for different senders and Inbox providers? Does a monthly email volume still matter? Let’s examine together.
Our updated report presents recent data for Q3 with comparison to Q2 2025, showcasing the chops and changes for:
- Average email deliverability rates per major email service providers;
- Average email deliverability rates per major Inbox Providers (Gmail, Outlook, AOL etc.);
- Average email deliverability rates per senders with varying monthly volume;
- Average email deliverability rates per major Inbox providers depending on a monthly volume.
Key Findings
– According to GlockApps tests, senders using Mailgun as an email service provider saw 20% more emails delivered in the Inboxes compared to Q2 2025;
– The average Inbox placement rates for Gmail and Google Workspace decreased by 5% and 7% compared to Q2 2025;
– The average Inbox placement rates for Outlook and Hotmail increased by 10% compared to Q2 2025;
– The average Inbox placement rates for senders with 1-10K and 1,000+K emails per month increased by 10% and 8% compared to Q2 2025;
– The average Inbox placement rates with Outlook and Hotmail for senders with 1-10K emails per month increased by 29% and 31% compared to Q2 2025;
– The average Inbox placement rates with Gmail and Google Workspace for senders with 200-1,000K emails per month decreased by 12% and 29% compared to Q2 2025.
Email Statistics 2025: Deliverability Rates per Top 10 Email Service Providers (ESPs)
We begin with presenting the average Inbox placement rates for the most popular email services used by GlockApps clients for email marketing in Q3 2005. The table also showcases the changes in Inbox delivery compared to Q2 2005.
| ESP | Average Inbox Rate (%), Q3 2025 | Average Inbox Rate (%), Q2 2025 | Change (%) |
| 51,78 | 49,97 | +1,81 | |
| Amazon SES | 58,65 | 58,16 | +0,49 |
| SendGrid | 37,79 | 33,82 | +3,97 |
| Outlook | 55,70 | 52,07 | +3,63 |
| Mailgun | 46,26 | 25,63 | +20,63 |
| Brevo | 31,11 | 24,68 | +6,43 |
| Klaviyo | 50,05 | 47,83 | +2,22 |
| ActiveCampaign | 42,13 | 37,07 | +5,06 |
| MailChimp | 48,67 | 46,63 | +2,04 |
| Hubspot | 54,17 | 55,00 | -0,83 |
Email Statistics 2025: Deliverability Rates per Major Inbox Providers
We continue with the average Inbox placement rates for the major inbox providers demonstrated by GlockApps tests in Q3 2025 comparing them to the rates received for Q2 2025:
| Inbox Provider | Average Inbox Rate (%), Q3 2025 | Average Inbox Rate (%), Q2 2025 | Change (%) |
| Gmail | 51,06 | 56,27 | -5,21 |
| Google Workspace | 50,74 | 58,60 | -7,86 |
| Outlook | 41,84 | 31,75 | +10,09 |
| Hotmail | 43,23 | 32,43 | +10,80 |
| Exchange (Office365) | 60,61 | 56,83 | +3,78 |
| AOL | 50,83 | 48,30 | +2,53 |
| Yahoo | 50,78 | 47,93 | +2,85 |
(Q3 vs Q2)
Email Statistics 2025: Deliverability Rates per Monthly Volume
Next, we share the statistics on the average deliverability rates in Q3 compared to Q2 2025 for email senders with varying monthly volume:
| Emails per month | Average Inbox Rate (%), Q3 2025 | Average Inbox Rate (%), Q2 2025 | Change (%) |
| 1 – 10k | 62,97 | 52,38 | +10,59 |
| 10k – 50k | 60,56 | 63,13 | -2,57 |
| 50k – 200k | 61,27 | 64,1 | -2,83 |
| 200k – 1,000k | 60,84 | 67,52 | -6,68 |
| 1,000k+ | 34,98 | 26,54 | +8,44 |
(Q3 vs Q2)
Email Statistics 2025: Changes in Deliverability Rates across the Major Inbox Providers Based on Monthly Volume
Finally, we present an aggregate table with the changes in the average Inbox placement rates for the most popular Inbox providers based on a monthly email volume in Q3 vs Q2 2025:
| Inbox Provider | Emails per month / Inbox Rate Change in Q3 2025 (%) | ||||
| 1 – 10k | 10k – 50k | 50k – 200k | 200k – 1,000k | 1,000k+ | |
| Gmail | +11,6 | -14,65 | -13,13 | -12,22 | +2,34 |
| Google Workspace | +8,01 | -7,37 | -11,52 | -29,58 | -1,77 |
| Outlook | +29,08 | +7,19 | +7,16 | -3,78 | +10,8 |
| Hotmail | +31,59 | +7,52 | +7,56 | -5,95 | +13,3 |
| Office365 | +7,88 | +4,75 | +11,79 | -12,88 | +7,36 |
| AOL | +9,19 | +5,31 | -5,96 | -7,32 | +11,46 |
| Yahoo | +7,69 | +6,19 | -3,86 | -7,98 | +12,25 |
Conclusion
The analysis of the recent tests justifies the need of email deliverability testing regardless of how your emails perform now. Inbox providers and spam filters continue sophisticating their mechanisms to block as much spam as possible. For senders taking proactive steps to identify email content issues or domain configuration glitches, the chances of having their emails delivered in the Inbox increase several times.
GlockApps Inbox Insight is here to help you find out where your emails land and how to optimize your email campaigns for Inbox placements.
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