Claude uses Iterable for marketing email and Mailgun for transactional/notifications. They rank #3,825 in the Tranco list of most-popular domains. Their email authentication setup is solid (score 100/100). We've recorded 3 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 anthropic.com. Policy
p=reject means receivers actively block or quarantine spoofed mail.
DKIM alignment: all 81 observed emails sign with a domain aligned with claude.com (email.claude.com). DKIM authenticates the visible From — supports DMARC directly.
VMC issued by: digicert.
TLS: 0% TLS 1.3, 100% TLS 1.2 (across 30 sends).
Delivery: fast — 86% of emails in the last 7 days arrive in under 10 seconds (across 7 sends).
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
None — only the primary ESP(s) shown aboveESPs 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.
No additional ESPs authorized in the brand's SPF beyond the confirmed senders above.
Probed: claude.com, email.claude.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 | 101 | 93.5% |
| promotions | 7 | 6.5% |
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 % |
|---|---|---|---|---|---|
| Iterable | 87 | 93.1% | 6.9% | 0.0% | |
| Mailgun | 17 | 94.1% | 5.9% | 0.0% |
Daily 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 claude.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 69.72.36.250 | outbound250.iterable.com |
15 | — | Check → |
| 159.112.240.156 | v5156.v5fc25cd0.use4.send.mailgun.net |
15 | — | Check → |
| 69.72.36.243 | outbound243.iterable.com |
10 | 1 | Check → |
| 159.112.240.153 | outbound153-2.iterable.com |
10 | — | Check → |
| 69.72.36.245 | outbound245.iterable.com |
9 | 1 | Check → |
| 69.72.36.249 | outbound249.iterable.com |
7 | — | Check → |
| 69.72.36.246 | outbound246.iterable.com |
7 | — | Check → |
| 159.112.240.151 | outbound151-2.iterable.com |
6 | — | Check → |
| 69.72.36.241 | outbound241.iterable.com |
6 | 1 | Check → |
| 159.112.240.154 | outbound154-2.iterable.com |
6 | 2 | Check → |
| 159.112.240.155 | outbound155-2.iterable.com |
4 | — | Check → |
| 69.72.36.247 | outbound247.iterable.com |
4 | — | Check → |
| 159.112.240.152 | outbound152-2.iterable.com |
4 | 1 | Check → |
| 69.72.36.240 | outbound240.iterable.com |
4 | 2 | Check → |
| 69.72.36.244 | outbound244.iterable.com |
1 | 1 | Check → |
| 69.72.36.242 | outbound242.iterable.com |
1 | 1 | Check → |