Happyhorizon uses Mailchimp for marketing email and Mailgun for transactional/notifications. We've also observed sends via 6 other providers: Deployteq, Amazon SES, HubSpot, Postmark, Dotdigital, SendGrid. Email goes out from 3 different subdomains. Their email authentication setup is good (score 73/100). Missing: DMARC enforcement. We've recorded 8 ESP changes since first observing this brand.
Non-ESP tools detected in this brand's emails. Independent of who sends — a brand can use any combination.
| HTML builder |
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.
DMARC reports sent to Red Sift OnDMARC. Policy
p=none is monitor-only — receivers won't act on spoofing yet.
SPF alignment: 83% of observed emails use an aligned return-path (atlassian-bounces.happyhorizon.com); the rest use third-party paths (structured.ai) where DMARC has to rely on DKIM alignment.
DKIM alignment: 99% of observed emails sign with an aligned DKIM key (happyhorizon.com, dev.happyhorizon.com); the rest sign with third-party keys (zendesk.com) where DMARC has to rely on SPF alignment.
TLS: modern — 80% TLS 1.3 (across 5 sends).
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
Deployteq 12 Amazon SES 11 HubSpot 5 Postmark 5 Dotdigital 3 SendGrid 3 Zendesk 2ESPs 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.
Amazon SES
✓ confirmed
"Observed" pills mean we detected emails from these ESPs, but they don't appear in any SPF record we probed. They may still be properly authorized — sending infrastructure can live on subdomains we haven't seen yet, or use IP-listing instead of include: directives.
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: happyhorizon.com, structured.ai, atlassian-bounces.happyhorizon.com, eindhoven.happyhorizon.com, dev.happyhorizon.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 | 77 | 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 % |
|---|---|---|---|---|---|
| Dotdigital | 3 | 100.0% | 0.0% | 0.0% | |
| Zendesk | 2 | 100.0% | 0.0% | 0.0% | |
| Amazon SES | 8 | 100.0% | 0.0% | 0.0% | |
| Deployteq | 11 | 100.0% | 0.0% | 0.0% | |
| HubSpot | 5 | 100.0% | 0.0% | 0.0% | |
| Mailchimp | 4 | 100.0% | 0.0% | 0.0% | |
| Mailgun | 13 | 100.0% | 0.0% | 0.0% | |
| Postmark | 5 | 100.0% | 0.0% | 0.0% | |
| SendGrid | 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 happyhorizon.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Reputation |
|---|---|---|---|
| 76.223.147.245 | c147-245.smtp-out.us-west-2.amazonses.com |
4 | Check → |
| 192.161.151.35 | mta-out5.pod20.usw2.zdsys.com |
1 | Check → |
| 76.223.144.221 | c144-221.smtp-out.us-west-2.amazonses.com |
1 | Check → |
| 76.223.147.218 | c147-218.smtp-out.us-west-2.amazonses.com |
1 | Check → |
| 188.172.137.48 | mta-out3.pod29.euw1.zdsys.com |
1 | Check → |
| 94.143.107.185 | r1c-rhodolite.mta.dotmailer.com |
1 | Check → |
| 76.223.144.220 | c144-220.smtp-out.us-west-2.amazonses.com |
1 | Check → |
| 94.143.108.127 | r1d-ceryneanhind.mta.dotmailer.com |
1 | Check → |
| 94.143.105.13 | r1a-achillobator.mta.dotmailer.com |
1 | Check → |
Per-IP inbox / promotions / spam is being collected and will appear here as new emails are observed.
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
happyhorizon.com | Mailchimp 20 Mailgun 13 Deployteq 12 Amazon SES 11 HubSpot 5 Postmark 5 SendGrid 3 Zendesk 1 | |
dev.happyhorizon.com | Dotdigital 3 | |
eindhoven.happyhorizon.com | Zendesk 1 |