Grey uses Customer.io for marketing email and SendGrid for transactional/notifications. They rank #368,119 in the Tranco list of most-popular domains. Their email authentication setup is solid (score 85/100).
Non-ESP tools detected in this brand's emails. Independent of who sends — a brand can use any combination.
| HTML builder |
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.
DMARC enforced with p=reject — receivers actively reject or quarantine spoofed mail. No aggregate reporting destination configured.
SPF alignment: all 7 observed emails use a return-path aligned with grey.co (cio113287.grey.co, em8937.grey.co). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 7 observed emails sign with a domain aligned with grey.co (cio113287.grey.co, grey.co). DKIM authenticates the visible From — supports DMARC directly.
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.
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: grey.co, em8937.grey.co, cio113287.grey.co
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 | 9 | 90.0% |
| promotions | 1 | 10.0% |
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 % |
|---|---|---|---|---|---|
| Customer.io | 3 | 100.0% | 0.0% | 0.0% | |
| SendGrid | 5 | 80.0% | 20.0% | 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 grey.co has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Reputation |
|---|---|---|---|
| 198.244.52.3 | a3.a355d2fe.use4.send.mailgun.net |
5 | Check → |
| 159.183.133.31 | wfbtvrkf.outbound-mail.sendgrid.net |
4 | Check → |
| 168.245.21.10 | xvfrkrhx.outbound-mail.sendgrid.net |
2 | Check → |
Per-IP inbox / promotions / spam is being collected and will appear here as new emails are observed.
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
grey.co | SendGrid 6 Customer.io 5 |