Builtin uses HubSpot for marketing email and Amazon SES for transactional/notifications. They rank #12,050 in the Tranco list of most-popular domains. Their email authentication setup is good (score 73/100). Missing: DMARC enforcement.
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 7 emails we've observed. DMARC policy is read live from DNS.
DMARC reports sent to builtin.com. Policy
p=none is monitor-only — receivers won't act on spoofing yet.
SPF alignment: 78% of observed emails use an aligned return-path (twmail.builtin.com); the rest use third-party paths (bf05x.hubspotemail.net) where DMARC has to rely on DKIM alignment.
DKIM alignment: all 9 observed emails sign with a domain aligned with builtin.com (builtin.com). DKIM authenticates the visible From — supports DMARC directly.
TLS: 75% TLS 1.3, 25% TLS 1.2 (across 8 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 4 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: builtin.com, twmail.builtin.com, bf05x.hubspotemail.net
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 | 11 | 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 % |
|---|---|---|---|---|---|
| Amazon SES | 7 | 100.0% | 0.0% | 0.0% | |
| HubSpot | 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 builtin.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 76.223.144.90 | c144-90.smtp-out.us-west-2.amazonses.com |
3 | 3 | Check → |
| 158.247.24.116 | bid47uu.bf05x.hubspotemail.net |
2 | — | Check → |
| 158.247.24.43 | bid47st.bf05x.hubspotemail.net |
2 | 1 | Check → |
| 76.223.144.92 | c144-92.smtp-out.us-west-2.amazonses.com |
2 | 2 | Check → |
| 76.223.144.91 | c144-91.smtp-out.us-west-2.amazonses.com |
1 | — | Check → |
| 54.240.117.234 | a117-234.smtp-out.us-west-2.amazonses.com |
1 | 1 | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
builtin.com | Amazon SES 7 HubSpot 4 |