Email Detective — ESP Tracker

Kit

kit.com ↗

🏆Rank #4,336 🏷 SaaS 🇺🇸United States ✓ Inbox 97%

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.

Marketing ESPKit

Transactional ESPSendGrid

Total observations403

Active days56

Avg per active day7.2

Last activity📬 Active · today

Cadence~every 2 days

Email setup 85/100

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).

Other ESPs detected

Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).

Confirmed senders

ESPs 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.

Amazon SES ✓ confirmed Kit ✓ confirmed Postmark ✓ confirmed SendGrid ✓ confirmed Intercom ✓ via SparkPost Customer.io ✓ via Mailgun Mailgun ✓ via sending IP HubSpot ✓ via sending IP

Other SPF authorizations

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.

Google Workspace SparkPost

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

Where emails landed (Gmail)

Folder distribution across all emails from this brand observed in Gmail inboxes. High inbox % = good deliverability; spam appearances are the headline signal.

Placement by ESP

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.

Daily observations per ESP. Brands often run multiple ESPs concurrently — marketing on one, transactional on another — so this chart shows usage rather than switches.

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Sending IPs

IP addresses kit.com has been observed sending from, and where their mail landed in Gmail.

Sending domains