Linear uses Loops for marketing email and Amazon SES for transactional/notifications. They rank #11,064 in the Tranco list of most-popular domains. Email goes out from 2 different subdomains. Their email authentication setup is solid (score 100/100).
Amazon SESAuthentication 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 DMARC Digests. Policy
p=reject means receivers actively block or quarantine spoofed mail.
SPF alignment: 96% of observed emails use an aligned return-path (envelope.updates.linear.app, outbound.intercom.linear.app); the rest use third-party paths (resonatelabs.com) where DMARC has to rely on DKIM alignment.
DKIM alignment: all 103 observed emails sign with a domain aligned with linear.app (linear.app, updates.linear.app). DKIM authenticates the visible From — supports DMARC directly.
TLS: modern — 100% TLS 1.3 (across 50 sends).
Delivery: fast — 95% of emails in the last 7 days arrive in under 10 seconds (across 20 sends).
Gmail's own filter showed these warnings to real subscribers in their inbox — independent of SPF/DKIM/DMARC pass/fail status. A consistent pattern often signals reputation issues or brand-impersonation concerns.
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
Intercom 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: linear.app, envelope.updates.linear.app, outbound.intercom.linear.app, resonatelabs.com, updates.linear.app
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 | 137 | 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 % |
|---|---|---|---|---|---|
| Amazon SES | 120 | 100.0% | 0.0% | 0.0% | |
| Intercom | 1 | 100.0% | 0.0% | 0.0% | |
| Loops | 8 | 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 linear.app has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 54.240.9.39 | a9-39.smtp-out.amazonses.com |
12 | — | Check → |
| 54.240.14.57 | a14-57.smtp-out.amazonses.com |
11 | 1 | Check → |
| 54.240.9.67 | a9-67.smtp-out.amazonses.com |
10 | 4 | Check → |
| 54.240.14.42 | a14-42.smtp-out.amazonses.com |
9 | 1 | Check → |
| 54.240.9.42 | a9-42.smtp-out.amazonses.com |
8 | 4 | Check → |
| 54.240.14.55 | a14-55.smtp-out.amazonses.com |
7 | — | Check → |
| 54.240.14.58 | a14-58.smtp-out.amazonses.com |
7 | — | Check → |
| 54.240.14.44 | a14-44.smtp-out.amazonses.com |
7 | 1 | Check → |
| 54.240.9.63 | a9-63.smtp-out.amazonses.com |
7 | 1 | Check → |
| 54.240.9.115 | a9-115.smtp-out.amazonses.com |
7 | 1 | Check → |
| 54.240.9.38 | a9-38.smtp-out.amazonses.com |
6 | 2 | Check → |
| 54.240.9.40 | a9-40.smtp-out.amazonses.com |
6 | 1 | Check → |
| 54.240.9.156 | a9-156.smtp-out.amazonses.com |
5 | — | Check → |
| 54.240.14.59 | a14-59.smtp-out.amazonses.com |
5 | — | Check → |
| 54.240.14.41 | a14-41.smtp-out.amazonses.com |
5 | 2 | Check → |
| 54.240.14.43 | a14-43.smtp-out.amazonses.com |
5 | 2 | Check → |
| 54.240.14.56 | a14-56.smtp-out.amazonses.com |
5 | — | Check → |
| 54.240.9.116 | a9-116.smtp-out.amazonses.com |
4 | 1 | Check → |
| 54.240.9.75 | a9-75.smtp-out.amazonses.com |
4 | 2 | Check → |
| 76.223.139.17 | c139-17.smtp-out.amazonses.com |
4 | 1 | Check → |
| 54.240.39.204 | a39-204.smtp-out.amazonses.com |
3 | — | Check → |
| 23.251.229.168 | e229-168.smtp-out.amazonses.com |
3 | — | Check → |
| 192.174.84.113 | mta-174-84-113.intercom.com.sparkpostmail.com |
1 | — | Check → |
| 216.221.169.107 | g169-107.smtp-out.amazonses.com |
1 | — | Check → |
| 24.110.89.109 | i89-109.smtp-out.amazonses.com |
1 | — | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
linear.app | Amazon SES 131 Intercom 1 | |
updates.linear.app | Loops 8 Amazon SES 4 |