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Mailchimp is the 2nd most popular marketing ESP we track.
Detected by 343 distinct extension users.
Distribution of brands using Mailchimp 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 607 of 971 brands tagged (63% 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 4,766 · promotions 592 · spam 120 (5,478 emails observed)
Percentages are averaged per brand (each counted once) across 216 brands using Mailchimp with at least 5 placement observations each.
Underlying transactional infrastructure Mailchimp routes through, detected from the sender hostname (PTR record) on each email's Received header. Bigger sample → more accurate.
Amazon SES
4 of 971 brands
912 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 |
|---|---|---|---|---|
|
Archive
archive.org
|
primary | 1 | — | 2026-06-09 |
|
Nature
nature.com
|
primary | 1 | — | 2026-05-02 |
|
Mailchimp
mailchimp.com
|
primary | 109 | 2.1% | 2026-06-29 |
|
Whitehouse
whitehouse.gov
|
primary | 4 | 0.0% | 2026-06-28 |
|
Psychologytoday
psychologytoday.com
|
primary | 2 | — | 2026-05-05 |
|
Pewresearch
pewresearch.org
|
primary | 1 | — | 2026-06-22 |
|
Elegantthemes
elegantthemes.com
|
primary | 4 | 0.0% | 2026-06-12 |
|
Gizmodo
gizmodo.com
|
primary | 3 | 0.0% | 2026-05-29 |
|
Hover
hover.com
|
primary | 1 | — | 2026-05-19 |
|
Technologyreview
technologyreview.com
|
primary | 28 | 0.0% | 2026-06-29 |
|
Trustindex
trustindex.io
|
primary | 16 | 0.0% | 2026-06-26 |
|
Loom
loom.com
|
primary | 37 | 0.0% | 2026-06-28 |
|
Tufts
tufts.edu
|
primary | 1 | — | 2026-06-12 |
|
Smallpdf
smallpdf.com
|
primary | 1 | — | 2026-05-11 |
|
Bostonglobe
bostonglobe.com
|
primary | 4 | 0.0% | 2026-06-23 |
|
Visualcapitalist
visualcapitalist.com
|
primary | 3 | 0.0% | 2026-05-22 |
|
Pp
pp.ua
|
primary | 1 | — | 2026-05-15 |
|
Acast
acast.com
|
primary | 1 | — | 2026-05-27 |
|
Bricklink
bricklink.com
|
primary | 3 | 0.0% | 2026-06-20 |
|
Haaretz
haaretz.com
|
primary | 33 | 0.0% | 2026-06-28 |
|
Nngroup
nngroup.com
|
primary | 1 | — | 2026-06-08 |
|
Smile
smile.io
|
primary | 1 | — | 2026-05-12 |
|
Onlinejobs
onlinejobs.ph
|
primary | 2 | — | 2026-06-04 |
|
Inverse
inverse.com
|
primary | 11 | 0.0% | 2026-06-27 |
|
Browserstack
browserstack.com
|
primary | 1 | — | 2026-06-24 |
|
Insidehighered
insidehighered.com
|
primary | 1 | — | 2026-06-23 |
|
Cognitoforms
cognitoforms.com
|
primary | 2 | — | 2026-06-15 |
|
Avclub
avclub.com
|
primary | 1 | — | 2026-05-02 |
|
Commondreams
commondreams.org
|
primary | 10 | 14% | 2026-06-21 |
|
Synthesia
synthesia.io
|
primary | 13 | 10% | 2026-06-10 |
|
Pocketcasts
pocketcasts.com
|
primary | 2 | — | 2026-05-30 |
|
Booksy
booksy.com
|
primary | 9 | 0.0% | 2026-06-21 |
|
Poets
poets.org
|
primary | 9 | 14% | 2026-06-19 |
|
Aeon
aeon.co
|
primary | 1 | — | 2026-06-20 |
|
Myminifactory
myminifactory.com
|
primary | 2 | — | 2026-05-21 |
|
Tatum
tatum.io
|
primary | 1 | — | 2026-05-05 |
|
Project Syndicate
project-syndicate.org
|
primary | 2 | — | 2026-06-17 |
|
Gamesindustry
gamesindustry.biz
|
primary | 1 | — | 2026-06-18 |
|
Chocolatey
chocolatey.org
|
primary | 1 | — | 2026-06-29 |
|
Gc
gc.com
|
primary | 1 | — | 2026-06-05 |
|
Sched
sched.com
|
primary | 3 | 0.0% | 2026-06-11 |
|
T3n
t3n.de
|
primary | 37 | 0.0% | 2026-06-24 |
|
Mediago
mediago.com
|
primary | 1 | — | 2026-06-03 |
|
Theringer
theringer.com
|
primary | 5 | 0.0% | 2026-06-19 |
|
Earthsky
earthsky.org
|
primary | 5 | 25% | 2026-06-19 |
|
Hackster
hackster.io
|
primary | 2 | 0.0% | 2026-06-26 |
|
Icij
icij.org
|
primary | 1 | — | 2026-06-18 |
|
Gotsport
gotsport.com
|
primary | 1 | — | 2026-06-08 |
|
Paradoxplaza
paradoxplaza.com
|
primary | 1 | — | 2026-05-30 |
|
Lexware
lexware.de
|
primary | 2 | — | 2026-05-20 |
|
Rhizome
rhizome.org
|
primary | 1 | — | 2026-06-18 |
|
Appodeal
appodeal.com
|
primary | 1 | — | 2026-05-27 |
|
Ny1
ny1.com
|
primary | 1 | — | 2026-04-30 |
|
Opus
opus.pro
|
primary | 8 | 0.0% | 2026-06-27 |
|
Halaxy
halaxy.com
|
primary | 1 | — | 2026-06-26 |
|
Pv Magazine
pv-magazine.com
|
primary | 1 | — | 2026-06-14 |
|
Conductor
conductor.com
|
primary | 2 | — | 2026-06-11 |
|
Accountingweb
accountingweb.co.uk
|
primary | 5 | 0.0% | 2026-05-26 |
|
Saveur
saveur.com
|
primary | 18 | 0.0% | 2026-06-29 |
|
Austinchronicle
austinchronicle.com
|
primary | 3 | 0.0% | 2026-06-25 |
|
Thestranger
thestranger.com
|
primary | 44 | 0.0% | 2026-06-29 |
|
Tixr
tixr.com
|
primary | 1 | — | 2026-06-01 |
|
Asiasociety
asiasociety.org
|
primary | 4 | 0.0% | 2026-06-04 |
|
Additudemag
additudemag.com
|
primary | 2 | — | 2026-06-23 |
|
Btgpactual
btgpactual.com
|
primary | 10 | 0.0% | 2026-06-10 |
|
Gen
gen.xyz
|
primary | 1 | — | 2026-06-20 |
|
Tapfiliate
tapfiliate.com
|
primary | 3 | 0.0% | 2026-06-23 |
|
Smbc Comics
smbc-comics.com
|
primary | 5 | 0.0% | 2026-06-19 |
|
Wweek
wweek.com
|
primary | 6 | 0.0% | 2026-06-19 |
|
Parkwhiz
parkwhiz.com
|
primary | 1 | — | 2026-06-02 |
|
Bostonreview
bostonreview.net
|
primary | 1 | — | 2026-06-18 |
|
Fromsmash
fromsmash.com
|
primary | 1 | — | 2026-06-03 |
|
Team Bhp
team-bhp.com
|
primary | 1 | — | 2026-05-02 |
|
Moneyweb
moneyweb.co.za
|
primary | 36 | 0.0% | 2026-06-29 |
|
Ultrahuman
ultrahuman.com
|
primary | 3 | 0.0% | 2026-06-03 |
|
Nutritionfacts
nutritionfacts.org
|
primary | 1 | — | 2026-05-09 |
|
Onepage
onepage.io
|
primary | 2 | — | 2026-06-19 |
|
Gunmagwarehouse
gunmagwarehouse.com
|
primary | 6 | 0.0% | 2026-06-24 |
|
Sparktoro
sparktoro.com
|
primary | 3 | 0.0% | 2026-05-26 |
|
Republic
republic.com
|
primary | 4 | 0.0% | 2026-06-30 |
|
Informacion
informacion.es
|
primary | 2 | 0.0% | 2026-06-05 |
|
Switch Bot
switch-bot.com
|
primary | 1 | — | 2026-05-07 |
|
Hamiltonwatch
hamiltonwatch.com
|
primary | 1 | — | 2026-05-06 |
|
Thenewsminute
thenewsminute.com
|
primary | 1 | — | 2026-05-20 |
|
Carta
carta.com
|
primary | 17 | 0.0% | 2026-06-28 |
|
Psyche
psyche.co
|
primary | 2 | — | 2026-05-22 |
|
Halfbakedharvest
halfbakedharvest.com
|
primary | 5 | 100% | 2026-06-23 |
|
Momentumdash
momentumdash.com
|
primary | 1 | — | 2026-05-11 |
|
The5ers
the5ers.com
|
primary | 8 | 0.0% | 2026-06-25 |
|
Purehockey
purehockey.com
|
primary | 2 | — | 2026-06-01 |
|
Opengov
opengov.com
|
primary | 1 | — | 2026-05-25 |
|
Forbestravelguide
forbestravelguide.com
|
primary | 2 | — | 2026-05-06 |
|
Bauhaus
bauhaus.es
|
primary | 10 | 0.0% | 2026-06-21 |
|
Garyvaynerchuk
garyvaynerchuk.com
|
primary | 3 | 0.0% | 2026-06-18 |
|
Gatestoneinstitute
gatestoneinstitute.org
|
primary | 1 | — | 2026-05-24 |
|
Gooverseas
gooverseas.com
|
primary | 8 | 0.0% | 2026-06-18 |
|
Djinni
djinni.co
|
primary | 7 | 60% | 2026-06-05 |
|
Siroko
siroko.com
|
primary | 1 | — | 2026-05-26 |
|
Hsnstore
hsnstore.com
|
primary | 1 | — | 2026-06-12 |
|
Bullionbypost
bullionbypost.co.uk
|
primary | 52 | 0.0% | 2026-06-29 |
IPs we've observed sending via Mailchimp. "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 |
|---|---|---|---|---|---|
| 198.2.135.65 | mail20.mcsignup.com |
16 | 24 | 4 | Check → |
| 198.2.135.66 | mail21.mcsignup.com |
17 | 23 | 1 | Check → |
| 198.2.175.11 | mail11.suw151.rsgsv.net |
1 | 20 | 1 | Check → |
| 198.2.130.6 | mail6.atl91.mcsv.net |
2 | 20 | 6 | Check → |
| 198.2.130.114 | mail114.atl91.mcsv.net |
1 | 18 | 1 | Check → |
| 198.2.141.10 | mail10.atl231.mcsv.net |
1 | 18 | 1 | Check → |
| 198.2.184.48 | mail48.suw91.mcdlv.net |
1 | 18 | — | Check → |
| 198.2.186.185 | postoffice.esharesinc.com |
1 | 17 | 5 | Check → |
| 198.2.182.188 | mail188.suw16.rsgsv.net |
2 | 17 | 12 | Check → |
| 198.2.178.114 | mail22.mcsignup.com |
10 | 16 | 1 | Check → |
| 205.201.135.8 | mail8.atl51.rsgsv.net |
2 | 14 | — | Check → |
| 148.105.8.31 | mail31.usw2001.mcdlv.net |
1 | 14 | 1 | Check → |
| 198.2.133.95 | mail14.mcsignup.com |
12 | 14 | 2 | Check → |
| 148.105.15.155 | mail155.sea101.rsgsv.net |
1 | 14 | — | Check → |
| 148.105.15.64 | mail64.sea91.rsgsv.net |
2 | 14 | 1 | Check → |
| 198.2.184.90 | mail90.suw91.mcdlv.net |
3 | 13 | 2 | Check → |
| 148.105.14.165 | mail165.sea81.mcsv.net |
1 | 13 | — | Check → |
| 198.2.136.244 | mailer.duonet.fr |
1 | 13 | 3 | Check → |
| 198.2.131.189 | mail189.atl121.mcsv.net |
1 | 13 | 3 | Check → |
| 198.2.130.155 | mail155.atl101.mcdlv.net |
1 | 13 | — | Check → |
| 198.2.182.199 | mail199.suw16.rsgsv.net |
2 | 12 | 3 | Check → |
| 148.105.12.223 | mail223.sea22.mcdlv.net |
3 | 12 | 1 | Check → |
| 148.105.15.68 | mail68.sea91.rsgsv.net |
3 | 12 | 1 | Check → |
| 205.201.133.136 | mail136.atl21.rsgsv.net |
1 | 12 | 3 | Check → |
| 205.201.133.235 | mail235.atl21.rsgsv.net |
1 | 11 | 1 | Check → |