New Email Deliverability Statistics: What Changed in Q2 2025?

Estimated reading time: 4 minutes

We continue our series of email deliverability statistics and now we are ready to present the data for Quarter 2 2025 examining email deliverability rates in comparison with Quarter 1 2025 and highlighting the major changes.

The new report presents un updated data on email deliverability and showcases the changes for:

• Top 10 email service providers (ESPs) used by GlockApps clients;
• Average deliverability rates per popular ESPs;
• Average deliverability rates per major Inbox providers;
• Average deliverability rates per senders with varying monthly volume.

Key Findings

– The percent of users of Google as the email service provider increased by 7,87% in Q2 vs Q1 2025 while the usage of SendGrid dropped by 8%;

– Amazon SES and MailChimp increased their average deliverability rates by 17,86% and 14,33% respectively in Q2 2025 compared to Q1 2025.

– The average deliverability rates across the most popular Inbox providers increased in Q2 2025 compared to Q1 2025 where the biggest changes were seen for AOL (+7,43%), Yahoo (+6,96%), and Office365 (+6,13%).

– The average email deliverability rates for senders with varying monthly volume (from 1 to 1,000K emails) increased by 2-6% in Q2 2025 compared to Q1 2025.

– The average email deliverability rate for senders with 1,000K+ emails per month decreased by 1,09% in Q2 2025.

Email Statistics 2025: Top 10 Email Service Providers

The analysis of email deliverability tests created by GlockApps clients in Q2 2025 brought up the following list of the most popular email service providers used to run email tests:

ESP	Usage (%)Q2, 2025	Usage (%), Q1 2025	Change (%)
Google	26,30	18,43	+7,87
Amazon SES	11,96	10,45	+1,51
Mailjet	9,35	8,43	+0,92
Sender-sib.com	8,93	7,11	+1,82
SendGrid	8,20	16,28	-8,08
Mailgun	6,55	4,85	+1,70
Outlook	6,12	4,21	+1,91
Amazon AWS	5,44	3,82	+1,62
Mailersend	2,50	2,45	+0,05
Mailin	2,25	2,64	-0,39

Email Statistics 2025: Average Deliverability Rates per Major ESPs

Next, we present the average Inbox placement rates for the major senders (ESPs) in Q2 2025 compared to Q1 2025:

ESP	Average Inbox Rate (%), Q2 2025	Average Inbox Rate (%), Q1 2025	Change (%)
Google	49,97	45,65	+4,32
Amazon SES	58,16	40,30	+17,86
SendGrid	33,82	35,31	-1,49
Mailgun	25,63	26,05	-0,42
Outlook	52,07	46,94	+5,13
Klaviyo	47,83	43,66	+4,17
MailChimp	46,63	32,30	+14,33
Brevo	24,68	24,93	-0,25

Email Statistics 2025: Average Deliverability Rates per Major Inbox Providers

Below is the comparison of the average Inbox delivery rates in Q2 vs Q1 2025 for the major inbox providers:

Inbox Provider	Average Inbox Rate (%), Q2 2025	Average Inbox Rate (%), Q1 2025	Change (%)
Gmail	56,27	53,70	+2,57
Google Workspace	58,6	53,36	+5,24
Outlook	31,75	26,77	+4,98
Hotmail	32,43	26,76	+5,67
Exchange (Office365)	56,83	50,70	+6,13
AOL	48,30	40,96	+7,34
Yahoo	47,93	40,97	+6,96

Email Statistics 2025: Average Deliverability Rates per Monthly Volume

Finally, we share the report about the changes in the deliverability in Q2 vs Q1 2025 for email senders with varying monthly volume:

Emails per month	Average Inbox Rate (%), Q2 2025	Average Inbox Rate (%), Q1 2025	Change (%)
1 – 10K	52,38	50,20	+2,18
10K – 50K	63,13	56,69	+6,44
50K – 200K	64,10	58,29	+5,81
200K – 1,000K	67,52	60,96	+6,56
1,000K+	26,54	27,73	-1,09

Conclusion

More and more email senders understand the importance of following best email practices in terms of email authentication, list management, and email optimization – being compliant with these leads to increased Inbox placement rates. With a changing email landscape, it is mandatory to monitor the sending infrastructure and email deliverability on a routine basis in order to not miss the moment when things start getting worse.

GlockApps Inbox Insight is here to help you find out where your emails land and how to optimize your email campaigns for Inbox placements.