InboxEagle

ESP Email Deliverability Insights

Each ESP has different approaches to shared IPs, DMARC alignment, and deliverability tooling. See how they compare — and which one fits your sending program.

ActiveCampaign

A

Customer experience automation platform

Primary inbox rate 20%
Avg spam rate 13.8%
Type Marketing

Amazon SES

B

Amazon's cloud-based email sending service

Primary inbox rate 19%
Avg spam rate 16.2%
Type Transactional

Braze

A

Customer engagement platform for enterprise brands

Primary inbox rate 23%
Avg spam rate 11.2%
Type Marketing

Brevo

B

All-in-one marketing platform (formerly Sendinblue)

Primary inbox rate 18%
Avg spam rate 15.4%
Type Marketing + Transactional

Campaign Monitor

B

Email marketing platform for small businesses and agencies

Primary inbox rate 19%
Avg spam rate 15.2%
Type Marketing

Constant Contact

C

Email marketing and online tools for small businesses

Primary inbox rate 17%
Avg spam rate 16.5%
Type Marketing

Drip

B

Email marketing and marketing automation for ecommerce

Primary inbox rate 20%
Avg spam rate 13.8%
Type Marketing

HubSpot

A

CRM-native email marketing and automation

Primary inbox rate 21%
Avg spam rate 13.2%
Type Marketing

Klaviyo

A

The ecommerce email and SMS platform

Primary inbox rate 22%
Avg spam rate 12.1%
Type Marketing

Mailchimp

B

The all-in-one marketing platform for small businesses

Primary inbox rate 18%
Avg spam rate 14.8%
Type Marketing

Mailgun

B

Email API for developers

Primary inbox rate 19%
Avg spam rate 17.3%
Type Transactional

Omnisend

B

Email and SMS marketing automation for ecommerce

Primary inbox rate 21%
Avg spam rate 14.2%
Type Marketing

Postmark

A

Transactional email built for speed and reliability

Primary inbox rate 30%
Avg spam rate 10.8%
Type Transactional

SendGrid

A

Transactional and marketing email delivery at scale

Primary inbox rate 20%
Avg spam rate 13.5%
Type Marketing + Transactional

Compare ESPs Head-to-Head

Not sure which ESP fits your use case? See detailed comparisons of inbox placement, DMARC alignment, features, and pricing across our top platforms.

Klaviyo vs Mailchimp SendGrid vs Mailchimp Klaviyo vs Omnisend SendGrid vs AWS SES HubSpot vs Klaviyo Klaviyo vs ActiveCampaign Klaviyo vs Brevo Mailchimp vs Constant Contact Mailchimp vs Brevo HubSpot vs Mailchimp Omnisend vs Mailchimp SendGrid vs Brevo ActiveCampaign vs Klaviyo Klaviyo vs Drip

Monitor your ESP's actual inbox placement

Benchmarks tell you industry averages. InboxEagle shows you your actual inbox placement rate across 20+ ISPs — including Gmail, Outlook, and Yahoo — updated after every send.

Start Free Trial