Usebouncer uses HubSpot for marketing email and Amazon SES for transactional/notifications. They rank #239,711 in the Tranco list of most-popular domains. We've also observed sends via 5 other providers: SendGrid, Mailgun, ActiveCampaign, Klaviyo, Salesforce MC. Email goes out from 3 different subdomains. Their email authentication setup is solid (score 95/100). We've recorded 7 ESP changes since first observing this brand.
Amazon SESAuthentication 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 usebouncer.com. Policy
p=reject means receivers actively block or quarantine spoofed mail.
SPF alignment: 96% of observed emails use an aligned return-path (143941294m.marketing.usebouncer.com, em8401.usebouncer.com); the rest use third-party paths (bf07.eu1.hubspotemail.net) where DMARC has to rely on DKIM alignment.
DKIM alignment: all 38 observed emails sign with a domain aligned with usebouncer.com (usebouncer.com, 143941294m.marketing.usebouncer.com). DKIM authenticates the visible From — supports DMARC directly.
TLS: 62% TLS 1.3, 38% TLS 1.2 (across 21 sends).
1 of 10 emails in the last 7 days were delayed beyond 5 minutes (10%) — peaks crossed 4 hours, which usually means stalled queues or hard receiver throttling. Slow sends averaged 5 h 38 min. Healthy senders deliver in under 30 seconds. Consistent delays usually mean greylisting, reputation-based throttling, or receiver-side filter scrutiny — worth investigating sender reputation and authentication setup.
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
Zendesk 5 SendGrid 4 Mailgun 2 ActiveCampaign 1 Klaviyo 1 Salesforce MC 1ESPs 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: usebouncer.com, 143941294m.marketing.usebouncer.com, em8401.usebouncer.com, bf07.eu1.hubspotemail.net, mail.usebouncer.com, app.usebouncer.com, marketing.usebouncer.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 | 54 | 96.4% |
| promotions | 2 | 3.6% |
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 | 15 | 100.0% | 0.0% | 0.0% | |
| HubSpot | 21 | 100.0% | 0.0% | 0.0% | |
| ActiveCampaign | 1 | 100.0% | 0.0% | 0.0% | |
| Klaviyo | 1 | 100.0% | 0.0% | 0.0% | |
| Mailgun | 2 | 100.0% | 0.0% | 0.0% | |
| Salesforce MC | 1 | 100.0% | 0.0% | 0.0% | |
| SendFox | 1 | 100.0% | 0.0% | 0.0% | |
| SendGrid | 4 | 75.0% | 25.0% | 0.0% | |
| Zendesk | 4 | 75.0% | 25.0% | 0.0% |
Monthly 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 usebouncer.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 143.244.83.111 | bd77e19.143941294m.marketing.usebouncer.com |
22 | 2 | Check → |
| 54.240.4.4 | a4-4.smtp-out.eu-west-1.amazonses.com |
2 | — | Check → |
| 188.172.138.5 | mta-out5.pod18.euc1.zdsys.com |
1 | — | Check → |
| 54.240.4.6 | a4-6.smtp-out.eu-west-1.amazonses.com |
1 | — | Check → |
| 54.240.4.5 | a4-5.smtp-out.eu-west-1.amazonses.com |
1 | — | Check → |
| 188.172.138.15 | mta-out15.pod18.euc1.zdsys.com |
1 | — | Check → |
| 54.240.4.15 | a4-15.smtp-out.eu-west-1.amazonses.com |
1 | — | Check → |
| 143.244.82.33 | bd77esz.bf07.eu1.hubspotemail.net |
1 | 1 | Check → |
| 54.240.4.3 | a4-3.smtp-out.eu-west-1.amazonses.com |
1 | 1 | Check → |
| 54.240.4.1 | a4-1.smtp-out.eu-west-1.amazonses.com |
1 | 1 | Check → |
| 188.172.138.3 | mta-out3.pod18.euc1.zdsys.com |
1 | 1 | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
usebouncer.com | Amazon SES 8 Zendesk 5 SendGrid 4 HubSpot 2 Mailgun 2 ActiveCampaign 1 Klaviyo 1 Salesforce MC 1 | 🚨 1/6 extreme delay (avg 5 h 38 min) |
mail.usebouncer.com | HubSpot 22 | |
app.usebouncer.com | Amazon SES 7 |