Email Detective — ESP Tracker

ESP	Category	Brands	Brand share	Observations	Obs share
SendGrid	transactional	1713	35.5%	17,352	33.7%
Amazon SES	transactional	1540	32.0%	19,151	37.1%
Mailgun	transactional	757	15.7%	6,734	13.1%
SparkPost	transactional	402	8.3%	3,511	6.8%
Postmark	transactional	261	5.4%	1,590	3.1%
Salesforce CRM	transactional	128	2.7%	1,452	2.8%
Mailjet	transactional	112	2.3%	609	1.2%
Pepipost	transactional	65	1.3%	451	0.9%
EmailLabs	transactional	31	0.6%	81	0.2%
Inboxroad	transactional	25	0.5%	157	0.3%
SMTP2GO	transactional	21	0.4%	50	0.1%
Resend	transactional	21	0.4%	42	0.1%
Mailersend	transactional	20	0.4%	89	0.2%
Strato	transactional	13	0.3%	37	0.1%
Elastic Email	transactional	10	0.2%	27	0.1%
GreenArrow	transactional	9	0.2%	34	0.1%
Mailtrap	transactional	7	0.1%	54	0.1%
Retarus	transactional	6	0.1%	59	0.1%
Maileroo	transactional	5	0.1%	30	0.1%
SocketLabs	transactional	4	0.1%	6	<0.1%
HCL Domino	transactional	4	0.1%	27	0.1%
Lindris	transactional	2	<0.1%	7	<0.1%
Mandrill	transactional	1	<0.1%	1	<0.1%

23 ESPs shown. Click any name for the full detail page (placement, infrastructure, brands, IPs).

About the share columns: Brand share = % of brands in the current filter that use this ESP (sums to >100% because brands often use multiple ESPs). Obs share = % of total send volume from this ESP. Each "observation" is one email an Email Detective user opened. Both are share-of-inbox among our users — not global market share. Sample is biased toward our user demographic and what they actually open.