Kit uses Kit for marketing email and SendGrid for transactional/notifications. They rank #4,336 in the Tranco list of most-popular domains. We've also observed sends via 7 other providers: Mailgun, HubSpot, Postmark, Amazon SES, Customer.io, Zendesk, Mailchimp. Email goes out from 11 different subdomains. Their email authentication setup is solid (score 85/100). We've recorded 17 ESP changes since first observing this brand.
Authentication signals observed in this brand's emails. SPF, DKIM and DMARC are the standard sender-authentication stack — see the DMARC policy below for whether spoofing is actually blocked or just monitored. One-click unsubscribe meets Google & Yahoo's bulk-sender requirements.
SPF / DKIM / DMARC above reflect the last 10 emails we've observed. DMARC policy is read live from DNS.
DMARC reports sent to cloudflare.net. Policy
p=reject means receivers actively block or quarantine spoofed mail.
SPF alignment: 94% of observed emails use an aligned return-path (mail.n.convertkit.com, em3184.kit.com, ckespa.mail.kit.com); the rest use third-party paths (bf04x.hubspotemail.net, expresseloans.com) where DMARC has to rely on DKIM alignment.
DKIM alignment: all 317 observed emails sign with a domain aligned with kit.com (kit.com, n.convertkit.com, mail.kit.com). DKIM authenticates the visible From — supports DMARC directly.
TLS: 75% TLS 1.3, 25% TLS 1.2 (across 135 sends).
Delivery: fast — 98% of emails in the last 7 days arrive in under 10 seconds (across 49 sends).
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
Intercom 32 Mailgun 27 HubSpot 11 Postmark 9 Amazon SES 6 Customer.io 3 Zendesk 1 Mailchimp 1ESPs we've seen sending email for this brand. Green = confirmed by SPF, sender IP rDNS, or known infra pairing (label shows the source). Grey = observed but not yet confirmed by SPF or PTR.
ESPs this brand has authorized in their SPF record. We confirm them with a green ✓ only after seeing recurring use (3+ emails across 2+ days). Until then they stay here — either we haven't observed any email yet, or we've seen a handful but not enough to call them a regular sender for the brand.
Probed: kit.com, mail.n.convertkit.com, ckespa.mail.kit.com, outbound.intercom.kit.com, em3184.kit.com, em9448.kit.com, arrows-bounces.onboarding.kit.com, expresseloans.com, em8698.app.convertkit.com, ckespa.kit.com, gh-mail.kit.com, send.signals.kit.com
Folder distribution across all emails from this brand observed in Gmail inboxes. High inbox % = good deliverability; spam appearances are the headline signal.
| Folder | Count | Share |
|---|---|---|
| inbox | 365 | 97.1% |
| promotions | 11 | 2.9% |
Which ESP's emails are landing where. Sorted by spam % so problem senders surface first. Brands using one ESP for marketing and another for transactional often see very different placement profiles per ESP. Per-ESP folder data only started being captured recently — counts here may be smaller than the total above until backfill catches up.
| ESP | Emails | Placement | Inbox % | Tabs % | Spam % |
|---|---|---|---|---|---|
| Intercom | 24 | 95.8% | 4.2% | 0.0% | |
| Kit | 201 | 100.0% | 0.0% | 0.0% | |
| Postmark | 9 | 100.0% | 0.0% | 0.0% | |
| SendGrid | 66 | 86.4% | 13.6% | 0.0% | |
| Mailgun | 20 | 100.0% | 0.0% | 0.0% | |
| Customer.io | 3 | 100.0% | 0.0% | 0.0% | |
| HubSpot | 11 | 100.0% | 0.0% | 0.0% | |
| Mailchimp | 1 | 100.0% | 0.0% | 0.0% | |
| Zendesk | 1 | 100.0% | 0.0% | 0.0% | |
| Amazon SES | 6 | 100.0% | 0.0% | 0.0% |
Weekly observations per ESP. Brands often run multiple ESPs concurrently — marketing on one, transactional on another — so this chart shows usage rather than switches.
IP addresses kit.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 149.72.196.235 | o40.ck.d.convertkit.com |
37 | 6 | Check → |
| 167.89.30.57 | o16.ck.n.convertkit.com |
24 | 2 | Check → |
| 192.174.84.114 | mta-174-84-114.intercom.com.sparkpostmail.com |
12 | — | Check → |
| 192.174.84.143 | mta-174-84-143.intercom.com.sparkpostmail.com |
9 | — | Check → |
| 143.244.90.210 | bd77gis.bf04x.hubspotemail.net |
5 | — | Check → |
| 192.174.84.124 | mta-174-84-124.intercom.com.sparkpostmail.com |
4 | — | Check → |
| 192.174.84.113 | mta-174-84-113.intercom.com.sparkpostmail.com |
4 | — | Check → |
| 192.174.84.123 | mta-174-84-123.intercom.com.sparkpostmail.com |
3 | — | Check → |
| 104.245.209.213 | mta213a-ord.mtasv.net |
3 | — | Check → |
| 161.38.193.10 | v510.v56f0a4e3.use4.send.mailgun.net |
3 | 1 | Check → |
| 159.183.200.47 | o51.ck.n.convertkit.com |
3 | — | Check → |
| 149.72.61.159 | o46.ck.n.convertkit.com |
3 | — | Check → |
| 143.244.90.232 | bd77gje.bf04x.hubspotemail.net |
3 | — | Check → |
| 50.31.205.220 | mta220-ab1.mtasv.net |
2 | — | Check → |
| 54.240.9.40 | a9-40.smtp-out.amazonses.com |
2 | — | Check → |
| 149.72.60.6 | o47.ck.n.convertkit.com |
2 | — | Check → |
| 149.72.193.89 | o48.ck.n.convertkit.com |
2 | — | Check → |
| 192.174.84.118 | mta-174-84-118.intercom.com.sparkpostmail.com |
2 | 2 | Check → |
| 108.179.148.137 | 4f2ol3.bf04x.hubspotemail.net |
2 | 2 | Check → |
| 198.244.59.35 | c35.c09224bb.usw1.send.mailgun.net |
1 | — | Check → |
| 149.72.235.3 | o33.ck.d.convertkit.com |
1 | — | Check → |
| 168.245.119.110 | o2.ck.h.convertkit.com |
1 | — | Check → |
| 104.245.209.199 | mta199a-ord.mtasv.net |
1 | — | Check → |
| 192.174.84.149 | mta-174-84-149.intercom.com.sparkpostmail.com |
1 | — | Check → |
| 104.245.209.198 | mta198a-ord.mtasv.net |
1 | — | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
kit.com | SendGrid 55 Kit 51 Intercom 31 Mailgun 24 HubSpot 11 Customer.io 3 Zendesk 1 Mailchimp 1 | |
convertkit.com | Kit 122 SendGrid 16 Intercom 1 Postmark 1 | |
mail.kit.com | Kit 49 | |
thegooddaily.convertkit.com | Kit 9 | |
drkaran.convertkit.com | Kit 8 | |
onboarding.kit.com | Postmark 8 | |
signals.kit.com | Amazon SES 6 | |
gh-mail.kit.com | Mailgun 3 | |
affiliates.convertkit.com | Kit 1 | |
onepercentimprovements.convertkit.com | Kit 1 | |
nordmedia.convertkit.com | Kit 1 |
