Transactional Email Services
Services focused on sending high-volume, programmatic transactional emails such as receipts, notifications, and password resets with deliverability tools and APIs.
Postmark is the default answer in AI responses for Transactional Email Services
Postmark and Amazon together dominate AI responses for Transactional Email Services. Both brands consistently surface unprompted, with the model treating them as the default answers for most category queries. Brands outside the top two face a structural disadvantage: users are usually given these two before the model even considers alternatives.
Brand Leaderboard All 36 Transactional Email Services brands ranked
Ranked by overall AI Visibility Score (geometric mean of LBA, Authority, and TOM). Click any brand for the full report.
| # | Brand | LBA | Authority | TOM | Overall |
|---|---|---|---|---|---|
| 1 |
 Postmark
postmarkapp.com
|
82 | 100 | 100 | 94 |
| 2 |
 Amazon
amazon.com
|
84 | 86 | 93 | 87 |
| 3 |
 SendGrid
sendgrid.com
|
82 | 81 | 100 | 87 |
| 4 |
 Mailgun
mailgun.com
|
90 | 67 | 90 | 82 |
| 5 |
 Resend
resend.com
|
75 | 23 | 37 | 40 |
| 6 |
B
Brevo
brevo.com
|
75 | 14 | 47 | 36 |
| 7 |
 SparkPost
sparkpost.com
|
77 | 9 | 57 | 34 |
| 8 |
 MailerSend
mailersend.com
|
63 | 4 | 13 | 15 |
| 9 |
 Elastic Email
elasticemail.com
|
66 | 0 | 6 | 2 |
| 10 |
 Mailchimp
mailchimp.com
|
79 | 0 | 5 | 2 |
| 11 |
 Mailjet
mailjet.com
|
71 | 0 | 16 | 2 |
| 12 |
 SMTP2GO
smtp2go.com
|
64 | 0 | 6 | 2 |
| 13 |
 Microsoft
microsoft.com
|
82 | 0 | 0 | 1 |
| 14 |
 SMTP.com
smtp.com
|
64 | 0 | 1 | 1 |
| 15 |
 SocketLabs
socketlabs.com
|
53 | 0 | 6 | 1 |
| 16 |
 AhaSend
ahasend.com
|
7 | 0 | 0 | 0 |
| 17 |
 AuthSMTP
authsmtp.com
|
38 | 0 | 0 | 0 |
| 18 |
 Courier
courier.com
|
58 | 0 | 0 | 0 |
| 19 |
 DuoCircle
duocircle.com
|
19 | 0 | 0 | 0 |
| 20 |
 EmailLabs
emaillabs.io
|
32 | 0 | 0 | 0 |
| 21 |
 Google
google.com
|
57 | 0 | 0 | 0 |
| 22 |
 GreenArrow
greenarrowemail.com
|
46 | 0 | 0 | 0 |
| 23 |
 Loops
loops.so
|
0 | 0 | 0 | 0 |
| 24 |
 Mailazy
mailazy.com
|
7 | 0 | 0 | 0 |
| 25 |
 MailPace
mailpace.com
|
24 | 0 | 0 | 0 |
| 26 |
 Mailtrap
mailtrap.io
|
75 | 0 | 0 | 0 |
| 27 |
 Mandrill
mandrill.com
|
66 | 0 | 0 | 0 |
| 28 |
 Netcore
netcorecloud.com
|
59 | 0 | 0 | 0 |
| 29 |
 Pepipost
pepipost.com
|
45 | 0 | 0 | 0 |
| 30 |
 SendPulse
sendpulse.com
|
65 | 0 | 0 | 0 |
| 31 |
 Shopify Tax
shopify.com
|
48 | 0 | 0 | 0 |
| 32 |
 Sweego
sweego.io
|
0 | 0 | 0 | 0 |
| 33 |
 TurboSMTP
turbo-smtp.com
|
53 | 0 | 0 | 0 |
| 34 |
 UniOne
unione.io
|
0 | 0 | 0 | 0 |
| 35 |
 WooCommerce
woocommerce.com
|
71 | 0 | 0 | 0 |
| 36 |
 ZeptoMail
zeptomail.com
|
63 | 0 | 0 | 0 |
How is this calculated? Methodology
Every brand in this leaderboard is scored against the same set of 276 shared Transactional Email Services prompts. The same prompts, same model, same iterations. So differences in scores reflect actual differences in AI visibility, not differences in measurement.
Overall AI Visibility Score
(LBA × Authority × TOM)^(1/3). Geometric mean is used so that any single weak metric pulls the overall score down, rather than being masked by strength elsewhere.
Shared industry prompts
Latent Brand Association (LBA)
quality × meta × stability × share × recognition × 100. Read the full LBA methodology →