Fast transactional email delivery.
Postmark is the 5th most popular transactional ESP we track.
Detected by 259 distinct extension users.
Distribution of brands using Postmark by industry. Helps you gauge whether this ESP is popular with businesses similar to yours. Brands tagged in two industries are counted in both.
Based on 222 of 257 brands tagged (86% coverage). Industries assigned automatically using AI; not every brand is tagged yet.
Where this ESP's emails land in Gmail. Each brand counted once (average of per-brand percentages) so a single high-volume sender can't dominate. Spam placement is mostly driven by the sender (list quality, content, complaint rate). This number reflects both the ESP's infrastructure AND the kind of senders who choose it — not just deliverability quality.
By volume: inbox 3,297 · promotions 166 · spam 19 (3,482 emails observed)
Percentages are averaged per brand (each counted once) across 100 brands using Postmark with at least 5 placement observations each.
195 as their primary ESP, the rest send transactional or secondary email through it. Primary users are listed first, then secondary.
| Brand | Role | Obs | Spam | Last seen |
|---|---|---|---|---|
|
Withgoogle
withgoogle.com
|
primary | 2 | — | 2026-06-10 |
|
Livechatinc
livechatinc.com
|
primary | 5 | 0.0% | 2026-06-28 |
|
Gamma
gamma.app
|
primary | 6 | 0.0% | 2026-06-17 |
|
Judge
judge.me
|
primary | 11 | 0.0% | 2026-06-26 |
|
Buymeacoffee
buymeacoffee.com
|
primary | 2 | — | 2026-06-02 |
|
Livechat
livechat.com
|
primary | 2 | — | 2026-06-18 |
|
16personalities
16personalities.com
|
primary | 2 | 0.0% | 2026-06-26 |
|
Kustomerapp
kustomerapp.com
|
primary | 1 | — | 2026-05-26 |
|
Supabase
supabase.com
|
primary | 14 | 0.0% | 2026-06-30 |
|
Thenounproject
thenounproject.com
|
primary | 1 | — | 2026-05-25 |
|
Hover
hover.to
|
primary | 3 | 0.0% | 2026-06-03 |
|
Letyshops
letyshops.com
|
primary | 3 | 0.0% | 2026-05-13 |
|
Paddle
paddle.com
|
primary | 25 | 0.0% | 2026-06-28 |
|
Cal
cal.com
|
primary | 16 | 0.0% | 2026-06-29 |
|
99designs
99designs.com
|
primary | 15 | 0.0% | 2026-05-28 |
|
Profitwell
profitwell.com
|
primary | 14 | 0.0% | 2026-06-29 |
|
Builtwith
builtwith.com
|
primary | 2 | — | 2026-06-21 |
|
Render
render.com
|
primary | 1 | — | 2026-05-02 |
|
Docsend
docsend.com
|
primary | 1 | — | 2026-05-02 |
|
Toogoodtogo
toogoodtogo.com
|
primary | 17 | 0.0% | 2026-06-24 |
|
Waveapps
waveapps.com
|
primary | 3 | 0.0% | 2026-06-22 |
|
Digistore24
digistore24.com
|
primary | 3 | 0.0% | 2026-06-08 |
|
Fathom
fathom.video
|
primary | 78 | 0.0% | 2026-06-26 |
|
Gleap
gleap.io
|
primary | 1 | — | 2026-06-03 |
|
Postmarkapp
postmarkapp.com
|
primary | 83 | 0.0% | 2026-06-22 |
|
Applytojob
applytojob.com
|
primary | 3 | 0.0% | 2026-06-11 |
|
Planespotters
planespotters.net
|
primary | 1 | — | 2026-05-25 |
|
Workos
workos.com
|
primary | 8 | 0.0% | 2026-05-06 |
|
Fillout
fillout.com
|
primary | 4 | 0.0% | 2026-06-26 |
|
Bigmarker
bigmarker.com
|
primary | 5 | 0.0% | 2026-06-16 |
|
Bitpanda
bitpanda.com
|
primary | 2 | — | 2026-06-18 |
|
Balsamiq
balsamiq.com
|
primary | 2 | — | 2026-06-28 |
|
Firstpromoter
firstpromoter.com
|
primary | 55 | 0.0% | 2026-06-29 |
|
Thrivethemes
thrivethemes.com
|
primary | 15 | 0.0% | 2026-06-08 |
|
Uscreen
uscreen.io
|
primary | 2 | — | 2026-06-09 |
|
Goldcast
goldcast.io
|
primary | 17 | 0.0% | 2026-06-25 |
|
K Rauta
k-rauta.ee
|
primary | 7 | 0.0% | 2026-06-15 |
|
Drata
drata.com
|
primary | 1 | — | 2026-06-04 |
|
Arbitersports
arbitersports.com
|
primary | 3 | 0.0% | 2026-06-26 |
|
Mealtrain
mealtrain.com
|
primary | 2 | — | 2025-09-05 |
|
Userjot
userjot.com
|
primary | 1 | — | 2026-06-17 |
|
Bookfunnel
bookfunnel.com
|
primary | 1 | — | 2026-06-12 |
|
Blinq
blinq.me
|
primary | 1 | — | 2026-05-04 |
|
Lattice
lattice.com
|
primary | 5 | 0.0% | 2026-05-21 |
|
Clearcompany
clearcompany.com
|
primary | 1 | — | 2026-05-22 |
|
Pinpointhq
pinpointhq.com
|
primary | 3 | 0.0% | 2026-06-22 |
|
My Hammer
my-hammer.de
|
primary | 1 | — | 2026-06-04 |
|
Santalolla
santalolla.com.br
|
primary | 3 | 100% | 2026-05-04 |
|
Metorik
metorik.com
|
primary | 1 | — | 2026-05-01 |
|
Ia
ia.net
|
primary | 1 | — | 2026-05-02 |
|
Smartlead
smartlead.ai
|
primary | 5 | 0.0% | 2026-06-14 |
|
Buttondown
buttondown.email
|
primary | 2 | — | 2026-06-24 |
|
Fountain
fountain.fm
|
primary | 2 | — | 2026-05-22 |
|
Castr
castr.com
|
primary | 1 | — | 2026-06-26 |
|
Saleshandy
saleshandy.com
|
primary | 8 | 0.0% | 2026-06-29 |
|
Helpdesk
helpdesk.com
|
primary | 6 | 0.0% | 2026-06-26 |
|
Proton
proton.ch
|
primary | 1 | — | 2026-04-08 |
|
Amplemarket
amplemarket.com
|
primary | 1 | — | 2026-05-11 |
|
Spar
spar.co.za
|
primary | 1 | — | 2026-06-22 |
|
Benchapp
benchapp.com
|
primary | 7 | 0.0% | 2026-06-08 |
|
Happyreturns
happyreturns.com
|
primary | 1 | — | 2026-05-07 |
|
Remotive
remotive.com
|
primary | 1 | — | 2026-06-29 |
|
Qualia
qualia.com
|
primary | 4 | 0.0% | 2026-05-19 |
|
Joinboulevard
joinboulevard.com
|
primary | 1 | — | 2026-06-11 |
|
Langdock
langdock.com
|
primary | 1 | — | 2026-05-21 |
|
Dataforseo
dataforseo.com
|
primary | 3 | 0.0% | 2026-06-23 |
|
Zenmaid
zenmaid.com
|
primary | 3 | 0.0% | 2026-06-20 |
|
Pentest Tools
pentest-tools.com
|
primary | 2 | — | 2026-05-13 |
|
Heartbeat
heartbeat.chat
|
primary | 11 | 0.0% | 2026-06-29 |
|
Spotdraft
spotdraft.com
|
primary | 1 | — | 2026-06-17 |
|
Thingtesting
thingtesting.com
|
primary | 1 | — | 2026-05-24 |
|
Malcare
malcare.com
|
primary | 5 | 0.0% | 2026-06-18 |
|
Property
property.ca
|
primary | 2 | — | 2026-06-01 |
|
Tideways
tideways.com
|
primary | 1 | — | 2026-05-06 |
|
Heartbingo
heartbingo.co.uk
|
primary | 1 | — | 2026-05-21 |
|
Schedulista
schedulista.com
|
primary | 1 | — | 2026-05-21 |
|
Blvd
blvd.co
|
primary | 11 | 0.0% | 2026-06-10 |
|
Savvycal
savvycal.com
|
primary | 27 | 0.0% | 2026-06-27 |
|
Unleash
unleash.ai
|
primary | 1 | — | 2026-05-16 |
|
Fireship
fireship.dev
|
primary | 1 | — | 2026-06-20 |
|
Memberspot
memberspot.de
|
primary | 4 | 0.0% | 2026-06-25 |
|
Woorise
woorise.com
|
primary | 2 | — | 2026-06-11 |
|
Drawnames
drawnames.com
|
primary | 1 | — | 2026-05-27 |
|
Rewardful
rewardful.com
|
primary | 33 | 0.0% | 2026-06-21 |
|
Primelending
primelending.com
|
primary | 5 | 0.0% | 2026-06-24 |
|
Lacompagnie
lacompagnie.com
|
primary | 1 | — | 2026-05-23 |
|
Torre
torre.ai
|
primary | 1 | — | 2026-06-08 |
|
Mentorcruise
mentorcruise.com
|
primary | 2 | 0.0% | 2026-06-29 |
|
Parnassys
parnassys.net
|
primary | 3 | 0.0% | 2026-06-23 |
|
Tinyemail
tinyemail.com
|
primary | 2 | 0.0% | 2026-06-17 |
|
Fsenrollment
fsenrollment.com
|
primary | 3 | 0.0% | 2026-06-26 |
|
Shopaew
shopaew.com
|
primary | 1 | — | 2026-05-31 |
|
Salesforge
salesforge.ai
|
primary | 1 | — | 2026-05-22 |
|
Kritische Anleger
kritische-anleger.de
|
primary | 1 | — | 2026-04-28 |
|
Clarel
clarel.es
|
primary | 2 | — | 2026-06-01 |
|
Conveyor
conveyor.com
|
primary | 3 | 0.0% | 2026-06-16 |
|
Famewall
famewall.io
|
primary | 1 | — | 2026-06-03 |
|
Woojer
woojer.com
|
primary | 1 | — | 2024-11-26 |
|
Servicespace
servicespace.org
|
primary | 2 | — | 2026-06-11 |
|
Rarebookcellar
rarebookcellar.com
|
primary | 1 | — | 2026-06-08 |
IPs we've observed sending via Postmark. "Brands" = distinct brands seen on each IP; "Placement" = where those emails landed in Gmail (inbox / promotions / spam). Click "reputation" to check the IP on Cisco Talos.
| IP | Hostname | Brands | Obs | Placement | Reputation |
|---|---|---|---|---|---|
| 50.31.156.116 | sc-ord-mta116.mtasv.net |
22 | 81 | 6 | Check → |
| 50.31.156.115 | sc-ord-mta115.mtasv.net |
20 | 80 | 7 | Check → |
| 50.31.156.126 | sc-ord-mta126.mtasv.net |
23 | 75 | 9 | Check → |
| 50.31.156.120 | sc-ord-mta120.mtasv.net |
18 | 72 | 12 | Check → |
| 50.31.156.113 | sc-ord-mta113.mtasv.net |
13 | 65 | 9 | Check → |
| 50.31.156.118 | sc-ord-mta118.mtasv.net |
22 | 62 | 7 | Check → |
| 50.31.156.117 | sc-ord-mta117.mtasv.net |
21 | 60 | 14 | Check → |
| 50.31.156.121 | sc-ord-mta121.mtasv.net |
21 | 55 | 11 | Check → |
| 50.31.156.114 | sc-ord-mta114.mtasv.net |
19 | 52 | 6 | Check → |
| 50.31.156.124 | sc-ord-mta124.mtasv.net |
16 | 44 | 9 | Check → |
| 104.245.209.196 | mta196a-ord.mtasv.net |
19 | 35 | 6 | Check → |
| 104.245.209.198 | mta198a-ord.mtasv.net |
16 | 35 | 9 | Check → |
| 104.245.209.210 | mta210a-ord.mtasv.net |
19 | 34 | 2 | Check → |
| 104.245.209.203 | mta203a-ord.mtasv.net |
12 | 31 | 3 | Check → |
| 104.245.209.215 | mta215a-ord.mtasv.net |
14 | 31 | 3 | Check → |
| 104.245.209.212 | mta212a-ord.mtasv.net |
13 | 30 | 6 | Check → |
| 104.245.209.213 | mta213a-ord.mtasv.net |
13 | 29 | 6 | Check → |
| 104.245.209.197 | mta197a-ord.mtasv.net |
18 | 28 | 8 | Check → |
| 50.31.205.203 | mta203-ab1.mtasv.net |
11 | 27 | 2 | Check → |
| 50.31.205.220 | mta220-ab1.mtasv.net |
15 | 26 | 5 | Check → |
| 104.245.209.235 | mta235b-ord.mtasv.net |
11 | 25 | 5 | Check → |
| 104.245.209.202 | mta202a-ord.mtasv.net |
14 | 25 | 3 | Check → |
| 104.245.209.200 | mta200a-ord.mtasv.net |
9 | 22 | 6 | Check → |
| 104.245.209.199 | mta199a-ord.mtasv.net |
14 | 22 | 3 | Check → |
| 50.31.205.204 | mta204-ab1.mtasv.net |
9 | 21 | — | Check → |