Glassdoor uses SendGrid as their primary email service provider. They rank #2,479 in the Tranco list of most-popular domains. Their email authentication setup is good (score 80/100).
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 dmarcian. Policy
p=quarantine means receivers actively block or quarantine spoofed mail.
SPF alignment: all 152 observed emails use a return-path aligned with glassdoor.com (mail9.glassdoor.com, mail9.content.glassdoor.com). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 138 observed emails sign with a domain aligned with glassdoor.com (glassdoor.com, content.glassdoor.com). DKIM authenticates the visible From — supports DMARC directly.
TLS: modern — 100% TLS 1.3 (across 94 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 31 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: glassdoor.com, mail9.glassdoor.com, mail9.content.glassdoor.com, mail8.glassdoor.com, content.glassdoor.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 | 120 | 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 % |
|---|---|---|---|---|---|
| SendGrid | 112 | 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 glassdoor.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 50.31.56.126 | o2.mail8.glassdoor.com |
22 | 3 | Check → |
| 149.72.129.82 | o12.mail9.content.glassdoor.com |
18 | 3 | Check → |
| 50.31.57.92 | o7.mail8.glassdoor.com |
17 | — | Check → |
| 50.31.60.111 | o8.mail8.glassdoor.com |
16 | 3 | Check → |
| 50.31.63.61 | o9.mail8.glassdoor.com |
16 | 4 | Check → |
| 50.31.57.90 | o5.mail8.glassdoor.com |
14 | 3 | Check → |
| 149.72.129.83 | wrqvvkrp.outbound-mail.sendgrid.net |
14 | 9 | Check → |
| 50.31.57.91 | o6.mail8.glassdoor.com |
10 | 1 | Check → |
| 50.31.57.250 | o1.mail8.glassdoor.com |
10 | 1 | Check → |
| 149.72.189.5 | o16.mail9.glassdoor.com |
9 | 2 | Check → |
| 149.72.129.84 | wrqvvkrq.outbound-mail.sendgrid.net |
8 | 2 | Check → |
| 149.72.172.37 | o15.mail9.glassdoor.com |
6 | 1 | Check → |
| 50.31.56.142 | o4.mail8.glassdoor.com |
2 | — | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
glassdoor.com | SendGrid 162 |