Zoominfo uses Marketo for marketing email and SendGrid for transactional/notifications. They rank #4,538 in the Tranco list of most-popular domains. We've also observed sends via Amazon SES. Email goes out from 2 different subdomains. Their email authentication setup is solid (score 85/100). Missing: SPF. We've recorded 6 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 Red Sift OnDMARC. Policy
p=reject means receivers actively block or quarantine spoofed mail.
SPF alignment: all 180 observed emails use a return-path aligned with zoominfo.com (em4075.zoominfo.com, returnpath.zoominfo.com, pendo.mkt.zoominfo.com). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 163 observed emails sign with a domain aligned with zoominfo.com (zoominfo.com, mkt.zoominfo.com). DKIM authenticates the visible From — supports DMARC directly.
VMC issued by: digicert.
TLS: modern — 98% TLS 1.3 (across 98 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 22 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).
Amazon SES 7ESPs 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: zoominfo.com, returnpath.zoominfo.com, em4075.zoominfo.com, pendo.mkt.zoominfo.com, mkt.zoominfo.com, dozisg1.zoominfo.com, dozisg3.zoominfo.com, dozisg2.zoominfo.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 | 149 | 90.3% |
| promotions | 16 | 9.7% |
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 | 7 | 57.1% | 42.9% | 0.0% | |
| Marketo | 30 | 56.7% | 43.3% | 0.0% | |
| SendGrid | 120 | 100.0% | 0.0% | 0.0% |
Weekly 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 zoominfo.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 149.72.180.203 | o2.dozisg2.zoominfo.com |
36 | 5 | Check → |
| 192.28.146.99 | returnpath.zoominfo.com |
35 | 4 | Check → |
| 167.89.80.251 | o3.dozisg3.zoominfo.com |
17 | — | Check → |
| 168.245.75.223 | o1.dozisg1.zoominfo.com |
15 | — | Check → |
| 76.223.142.105 | c142-105.smtp-out.amazonses.com |
5 | 3 | Check → |
| 76.223.142.103 | c142-103.smtp-out.amazonses.com |
2 | — | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
zoominfo.com | SendGrid 146 | |
mkt.zoominfo.com | Marketo 35 Amazon SES 7 |
