Help desk and customer support ticketing system.
Zendesk is the 2nd most popular support ESP we track.
Detected by 136 distinct extension users.
Distribution of brands using Zendesk 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 90 of 90 brands tagged. 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 3,942 · promotions 66 · spam 13 (4,021 emails observed)
Percentages are averaged per brand (each counted once) across 48 brands using Zendesk with at least 5 placement observations each.
49 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 |
|---|---|---|---|---|
|
Plesk
plesk.com
|
primary | 5 | 0.0% | 2026-05-23 |
|
Tp Link
tp-link.com
|
primary | 5 | 0.0% | 2026-06-06 |
|
Zendesk
zendesk.com
|
primary | 314 | 0.0% | 2026-06-29 |
|
Match
match.com
|
primary | 2 | — | 2026-06-29 |
|
Fcc
fcc.gov
|
primary | 1 | — | 2026-05-27 |
|
Webflow
webflow.com
|
primary | 10 | 0.0% | 2026-06-11 |
|
Ripe
ripe.net
|
primary | 3 | 0.0% | 2026-06-05 |
|
Reolink
reolink.com
|
primary | 3 | 0.0% | 2026-05-19 |
|
Heapanalytics
heapanalytics.com
|
primary | 2 | — | 2026-06-26 |
|
Attentivemobile
attentivemobile.com
|
primary | 45 | 0.0% | 2026-06-25 |
|
Leroymerlin
leroymerlin.pl
|
primary | 1 | — | 2026-05-05 |
|
Whitepages
whitepages.com
|
primary | 3 | 0.0% | 2026-05-23 |
|
Spreadshirt
spreadshirt.com
|
primary | 1 | — | 2026-05-24 |
|
Splashlearn
splashlearn.com
|
primary | 2 | — | 2026-05-04 |
|
Embed
embed.ly
|
primary | 12 | 0.0% | 2026-06-12 |
|
Current
current.com
|
primary | 1 | — | 2026-05-24 |
|
Smava
smava.de
|
primary | 1 | — | 2026-05-24 |
|
Busbud
busbud.com
|
primary | 1 | — | 2026-05-24 |
|
Windsorstore
windsorstore.com
|
primary | 1 | — | 2026-05-28 |
|
Mailpoet
mailpoet.com
|
primary | 3 | 0.0% | 2026-05-24 |
|
Dogado
dogado.de
|
primary | 1 | — | 2026-06-01 |
|
Pelcro
pelcro.com
|
primary | 2 | 0.0% | 2026-05-26 |
|
Theknotww
theknotww.com
|
primary | 1 | — | 2026-05-04 |
|
Kokuchpro
kokuchpro.com
|
primary | 11 | 0.0% | 2026-06-04 |
|
Fromdoppler
fromdoppler.com
|
primary | 18 | 0.0% | 2026-06-29 |
|
Spotler
spotler.com
|
primary | 3 | 0.0% | 2026-05-04 |
|
Alfahosting
alfahosting.de
|
primary | 2 | — | 2026-05-25 |
|
Goaheadtours
goaheadtours.com
|
primary | 1 | — | 2026-05-18 |
|
Nebulahoroscope
nebulahoroscope.com
|
primary | 1 | — | 2026-06-29 |
|
Regiondo
regiondo.com
|
primary | 1 | — | 2026-05-24 |
|
Veebimajutus
veebimajutus.ee
|
primary | 1 | — | 2026-06-05 |
|
Museumoficecream
museumoficecream.com
|
primary | 3 | 0.0% | 2026-06-08 |
|
Remarkety
remarkety.com
|
primary | 13 | 0.0% | 2026-06-22 |
|
Lindehobby
lindehobby.com
|
primary | 1 | — | 2026-06-23 |
|
Makenotion
makenotion.com
|
primary | 2 | — | 2026-06-25 |
|
Group Indigo
group-indigo.com
|
primary | 3 | 0.0% | 2026-05-11 |
|
Elastiq Sf
elastiq-sf.com
|
primary | 1 | — | 2026-05-18 |
|
Endeavorstreaming
endeavorstreaming.com
|
primary | 1 | — | 2026-05-24 |
|
Gahegoot
gahegoot.com
|
primary | 1 | — | 2026-05-24 |
|
Halon
halon.io
|
primary | 11 | 0.0% | 2026-06-26 |
|
Heartsdesireconcerts
heartsdesireconcerts.com
|
primary | 6 | 0.0% | 2026-05-31 |
|
Metsapeikko
metsapeikko.com
|
primary | 6 | 0.0% | 2026-05-31 |
|
Riverty
riverty.nl
|
primary | 3 | 0.0% | 2026-06-27 |
|
Rubbermagazijn
rubbermagazijn.nl
|
primary | 1 | — | 2026-05-15 |
|
Smarttrace
smarttrace.org.uk
|
primary | 1 | — | 2026-06-23 |
|
Spotler
spotler.nl
|
primary | 1 | — | 2026-05-04 |
|
Structured
structured.ai
|
primary | 1 | — | 2026-05-13 |
|
Themobilitydepot
themobilitydepot.com
|
primary | 1 | — | 2026-05-20 |
|
Wyzeapply
wyzeapply.com
|
primary | 1 | — | 2026-06-04 |
Shopify
shopify.com
|
secondary | 11 | 0.9% | 2026-06-08 |
|
Discord
discord.com
|
secondary | 1 | 12% | 2023-01-31 |
|
Klaviyo
klaviyo.com
|
secondary | 73 | 0.0% | 2026-06-29 |
Squarespace
squarespace.com
|
secondary | 2 | 0.0% | 2026-05-26 |
|
Twilio
twilio.com
|
secondary | 1 | 0.0% | 2026-06-15 |
|
Miro
miro.com
|
secondary | 2 | 0.0% | 2026-05-28 |
|
Customer
customer.io
|
secondary | 26 | 0.0% | 2026-06-30 |
|
Clickup
clickup.com
|
secondary | 4 | 0.0% | 2026-06-10 |
|
Brevo
brevo.com
|
secondary | 29 | 0.0% | 2026-06-30 |
|
Iterable
iterable.com
|
secondary | 1 | 0.0% | 2026-06-05 |
|
Dashlane
dashlane.com
|
secondary | 1 | 0.0% | 2026-06-03 |
|
Parsely
parsely.com
|
secondary | 3 | 0.0% | 2026-06-05 |
|
Kit
kit.com
|
secondary | 1 | 0.0% | 2026-05-14 |
|
Cleverreach
cleverreach.com
|
secondary | 17 | 0.0% | 2026-06-30 |
|
ActiveCampaign
activecampaign.com
|
secondary | 10 | 6.0% | 2026-06-25 |
|
Bloomreach
bloomreach.com
|
secondary | 1 | 0.0% | 2026-06-10 |
|
Zone
zone.ee
|
secondary | 2 | 0.0% | 2026-06-25 |
|
Fivetran
fivetran.com
|
secondary | 2 | 0.0% | 2026-06-30 |
|
Circle
circle.so
|
secondary | 3 | 0.0% | 2026-06-01 |
|
Justworks
justworks.com
|
secondary | 42 | 0.0% | 2026-06-30 |
|
Simplepractice
simplepractice.com
|
secondary | 1 | 0.0% | 2026-06-03 |
|
Close
close.com
|
secondary | 1 | 0.0% | 2026-05-24 |
|
Deel
deel.com
|
secondary | 14 | 0.0% | 2026-06-02 |
|
Mercury
mercury.com
|
secondary | 1 | 0.0% | 2026-06-12 |
|
Partnerstack
partnerstack.com
|
secondary | 6 | 0.0% | 2026-06-09 |
|
Movableink
movableink.com
|
secondary | 20 | 0.0% | 2026-06-15 |
|
Contabilizei
contabilizei.com.br
|
secondary | 4 | 0.0% | 2026-06-11 |
|
Lattice
lattice.com
|
secondary | 1 | 0.0% | 2026-06-29 |
|
Reallygoodemails
reallygoodemails.com
|
secondary | 3 | 0.0% | 2026-05-15 |
|
Themarketer
themarketer.com
|
secondary | 3 | 0.0% | 2026-06-11 |
|
Tinuiti
tinuiti.com
|
secondary | 4 | 0.0% | 2026-06-26 |
|
Tremendous
tremendous.com
|
secondary | 12 | 0.0% | 2026-05-29 |
|
Vidaxl
vidaxl.com
|
secondary | 1 | — | 2026-05-27 |
|
Lhv
lhv.ee
|
secondary | 1 | 0.0% | 2026-05-21 |
|
Usebouncer
usebouncer.com
|
secondary | 5 | 0.0% | 2026-06-29 |
|
Sofi
sofi.org
|
secondary | 1 | — | 2026-05-27 |
|
Unione
unione.io
|
secondary | 2 | 0.0% | 2026-06-05 |
|
Codecrew
codecrew.us
|
secondary | 2 | 8.3% | 2026-06-11 |
|
Happyhorizon
happyhorizon.com
|
secondary | 2 | 0.0% | 2026-05-27 |
|
Makingsense
makingsense.com
|
secondary | 5 | 0.0% | 2026-06-30 |
|
Trtuningline
trtuningline.com
|
secondary | 1 | 0.0% | 2026-05-03 |
IPs we've observed sending via Zendesk. "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 |
|---|---|---|---|---|---|
| 192.161.152.45 | mta-out15.pod27.use2.zdsys.com |
5 | 32 | 3 | Check → |
| 192.161.152.40 | mta-out10.pod27.use2.zdsys.com |
5 | 29 | 3 | Check → |
| 192.161.152.43 | mta-out13.pod27.use2.zdsys.com |
3 | 22 | 4 | Check → |
| 192.161.152.39 | mta-out9.pod27.use2.zdsys.com |
3 | 22 | 2 | Check → |
| 192.161.152.31 | mta-out1.pod27.use2.zdsys.com |
2 | 22 | — | Check → |
| 192.161.152.42 | mta-out12.pod27.use2.zdsys.com |
4 | 20 | 2 | Check → |
| 192.161.152.41 | mta-out11.pod27.use2.zdsys.com |
4 | 20 | 1 | Check → |
| 192.161.152.33 | mta-out3.pod27.use2.zdsys.com |
2 | 20 | 4 | Check → |
| 192.161.152.37 | mta-out7.pod27.use2.zdsys.com |
5 | 18 | 1 | Check → |
| 192.161.152.35 | mta-out5.pod27.use2.zdsys.com |
3 | 18 | 1 | Check → |
| 192.161.152.38 | mta-out8.pod27.use2.zdsys.com |
3 | 14 | 3 | Check → |
| 192.161.152.34 | mta-out4.pod27.use2.zdsys.com |
4 | 14 | 1 | Check → |
| 192.161.152.32 | mta-out2.pod27.use2.zdsys.com |
4 | 14 | 3 | Check → |
| 188.172.138.43 | mta-out13.pod28.euc1.zdsys.com |
3 | 12 | 1 | Check → |
| 192.161.152.36 | mta-out6.pod27.use2.zdsys.com |
5 | 12 | 1 | Check → |
| 188.172.138.9 | mta-out9.pod18.euc1.zdsys.com |
3 | 12 | 5 | Check → |
| 192.161.149.42 | mta-out12.pod23.use1.zdsys.com |
4 | 12 | 3 | Check → |
| 192.161.152.44 | mta-out14.pod27.use2.zdsys.com |
3 | 11 | 1 | Check → |
| 192.161.149.40 | mta-out10.pod23.use1.zdsys.com |
3 | 10 | 1 | Check → |
| 192.161.151.31 | mta-out1.pod20.usw2.zdsys.com |
4 | 10 | 3 | Check → |
| 192.161.149.38 | mta-out8.pod23.use1.zdsys.com |
2 | 9 | 1 | Check → |
| 192.161.149.36 | mta-out6.pod23.use1.zdsys.com |
4 | 9 | 2 | Check → |
| 188.172.138.33 | mta-out3.pod28.euc1.zdsys.com |
2 | 9 | 6 | Check → |
| 192.161.149.31 | mta-out1.pod23.use1.zdsys.com |
2 | 8 | 4 | Check → |
| 192.161.149.45 | mta-out15.pod23.use1.zdsys.com |
2 | 8 | 3 | Check → |