Attio uses Customer.io for marketing email and Postmark for transactional/notifications. They rank #65,824 in the Tranco list of most-popular domains. Email goes out from 2 different subdomains. Their email authentication setup is solid (score 100/100). We've recorded 1 ESP change 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 Postmark DMARC. Policy
p=reject means receivers actively block or quarantine spoofed mail.
SPF alignment: 83% of observed emails use an aligned return-path (pm-bounces.mail.attio.com, pm-bounces.attio.com); the rest use third-party paths (gmail.com) where DMARC has to rely on DKIM alignment.
DKIM alignment: all 34 observed emails sign with a domain aligned with attio.com (mail.attio.com, attio.com). DKIM authenticates the visible From — supports DMARC directly.
TLS: modern — 100% TLS 1.3 (across 32 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.
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: attio.com, gmail.com, pm-bounces.mail.attio.com, pm-bounces.attio.com, mail.attio.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 | 38 | 100.0% |
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 | 22 | 100.0% | 0.0% | 0.0% | |
| Postmark | 12 | 100.0% | 0.0% | 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 attio.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 50.31.205.11 | mta11-ab1.mtasv.net |
9 | 3 | Check → |
| 50.31.205.10 | mta10-ab1.mtasv.net |
4 | 2 | Check → |
| 50.31.156.116 | sc-ord-mta116.mtasv.net |
3 | 2 | Check → |
| 50.31.205.249 | mta249-ab1.mtasv.net |
2 | 1 | Check → |
| 50.31.205.247 | mta247-ab1.mtasv.net |
2 | 2 | Check → |
| 50.31.156.113 | sc-ord-mta113.mtasv.net |
2 | 2 | Check → |
| 50.31.156.126 | sc-ord-mta126.mtasv.net |
2 | 2 | Check → |
| 50.31.156.120 | sc-ord-mta120.mtasv.net |
1 | — | Check → |
| 50.31.205.25 | mta25-ab1.mtasv.net |
1 | — | Check → |
| 50.31.205.9 | mta9-ab1.mtasv.net |
1 | — | Check → |
| 50.31.156.121 | sc-ord-mta121.mtasv.net |
1 | — | Check → |
| 50.31.205.7 | mta7-ab1.mtasv.net |
1 | — | Check → |
| 50.31.205.8 | mta8-ab1.mtasv.net |
1 | 1 | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
mail.attio.com | Customer.io 22 Postmark 12 | |
attio.com | Customer.io 4 |