T Mobile uses SendGrid as their primary email service provider. They rank #438 in the Tranco list of most-popular domains. Email goes out from 2 different subdomains. Their email authentication setup is solid (score 100/100).
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 7 emails we've observed. DMARC policy is read live from DNS.
DMARC reports sent to t-mobile.com. Policy
p=reject means receivers actively block or quarantine spoofed mail.
SPF alignment: all 12 observed emails use a return-path aligned with t-mobile.com (exz.system.t-mobile.com, pxz.mktg.t-mobile.com). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 12 observed emails sign with a domain aligned with t-mobile.com (system.t-mobile.com, mktg.t-mobile.com). DKIM authenticates the visible From — supports DMARC directly.
VMC issued by: digicert.
TLS: modern — 100% TLS 1.3 (across 9 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 7 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: t-mobile.com, exz.system.t-mobile.com, pxz.mktg.t-mobile.com, system.t-mobile.com, mktg.t-mobile.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 | 6 | 54.5% |
| promotions | 5 | 45.5% |
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 % |
|---|---|---|---|---|---|
| SendGrid | 10 | 50.0% | 50.0% | 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 t-mobile.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 159.183.169.147 | o3387.pxz.mktg.assurancewireless.com |
5 | 3 | Check → |
| 159.183.169.56 | o3391.pxz.mktg.t-mobile.com |
3 | 1 | Check → |
| 159.183.168.156 | o3377.exz.system.t-mobile.com |
1 | — | Check → |
| 159.183.169.38 | o3398.pxz.mktg.t-mobile.com |
1 | — | Check → |
| 159.183.168.105 | o3375.pxz.mktg.t-mobile.com |
1 | — | Check → |
| 159.183.169.80 | o3395.pxz.mktg.t-mobile.com |
1 | — | Check → |
| 159.183.169.41 | o3390.pxz.mktg.t-mobile.com |
1 | 1 | Check → |