Senja uses Customer.io for marketing email and Postmark for transactional/notifications. They rank #60,661 in the Tranco list of most-popular domains. Their email authentication setup is solid (score 85/100).
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 enforced with p=reject — receivers actively reject or quarantine spoofed mail. No aggregate reporting destination configured.
SPF alignment: 97% of observed emails use an aligned return-path (cio119341.senja.io, pm-bounces.senja.io); the rest use third-party paths (gmail.com) where DMARC has to rely on DKIM alignment.
DKIM alignment: all 26 observed emails sign with a domain aligned with senja.io (cio119341.senja.io, senja.io). DKIM authenticates the visible From — supports DMARC directly.
TLS: 50% TLS 1.3, 50% TLS 1.2 (across 8 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 5 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: senja.io, cio119341.senja.io, gmail.com, pm-bounces.senja.io
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 | 27 | 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 % |
|---|---|---|---|---|---|
| Customer.io | 21 | 100.0% | 0.0% | 0.0% | |
| Postmark | 3 | 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 senja.io has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 159.112.241.114 | v5114.v5c4dda55.use4.send.mailgun.net |
16 | 3 | Check → |
| 161.38.193.63 | v563.v56f0a4e3.use4.send.mailgun.net |
15 | — | Check → |
| 104.245.209.200 | mta200a-ord.mtasv.net |
1 | 1 | Check → |
| 104.245.209.246 | mta246b-ord.mtasv.net |
1 | 1 | Check → |
| 50.31.205.207 | mta207-ab1.mtasv.net |
1 | 1 | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
senja.io | Customer.io 32 Postmark 3 |