Zillow uses SparkPost as their primary email service provider. They rank #753 in the Tranco list of most-popular domains. We've also observed sends via Amazon SES. Email goes out from 6 different subdomains. Their email authentication setup is solid (score 95/100). 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 Validity (EmailAnalyst). Policy
p=quarantine means receivers actively block or quarantine spoofed mail.
SPF alignment: observed emails use a third-party return-path (amazonses.com, gmail.com) — SPF passes there but doesn't align with zillow.com, so DMARC has to rely on DKIM alignment.
DKIM alignment: all 99 observed emails sign with a domain aligned with zillow.com (mail.zillow.com, zmail.zillow.com, confirmation.zillow.com). DKIM authenticates the visible From — supports DMARC directly.
TLS: 25% TLS 1.3, 75% TLS 1.2 (across 48 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 13 sends).
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
Amazon SES 20ESPs 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: zillow.com, gmail.com, amazonses.com, mail.zillow.com, zmail.zillow.com, confirmation.zillow.com, comet.zillow.com, identity.zillow.com, notifications.zillow.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 | 99 | 92.5% |
| promotions | 8 | 7.5% |
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 | 16 | 81.3% | 18.8% | 0.0% | |
| SparkPost | 79 | 96.2% | 3.8% | 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 zillow.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 192.158.253.130 | mta-253-130.zillowmail.com |
48 | 2 | Check → |
| 192.158.253.129 | mta-253-129.zillowmail.com |
38 | 6 | Check → |
| 216.221.173.104 | g173-104.smtp-out.amazonses.com |
7 | — | Check → |
| 216.221.173.109 | g173-109.smtp-out.amazonses.com |
6 | — | Check → |
| 192.158.253.22 | mta-253-22.zillowmail.com |
6 | — | Check → |
| 192.158.253.32 | mta-253-32.zillowmail.com |
6 | — | Check → |
| 216.221.173.108 | g173-108.smtp-out.amazonses.com |
3 | 3 | Check → |
| 54.240.11.18 | a11-18.smtp-out.amazonses.com |
1 | — | Check → |
| 216.221.173.117 | g173-117.smtp-out.amazonses.com |
1 | 1 | Check → |
| 216.221.173.118 | g173-118.smtp-out.amazonses.com |
1 | 1 | Check → |
| 216.221.173.111 | g173-111.smtp-out.amazonses.com |
1 | 1 | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
mail.zillow.com | SparkPost 92 | |
zmail.zillow.com | Amazon SES 18 | |
confirmation.zillow.com | SparkPost 9 | |
identity.zillow.com | SparkPost 7 | |
comet.zillow.com | Amazon SES 1 | |
notifications.zillow.com | Amazon SES 1 |
