Scienceofscaling uses HubSpot as their primary email service provider. Their email authentication setup is good (score 73/100). Missing: DMARC enforcement.
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 3 emails we've observed. DMARC policy is read live from DNS.
DMARC published as p=none with no rua= reporting — monitor-only, and the sender isn't collecting reports either.
SPF alignment: observed emails use a third-party return-path (20627419m.thehustle.co) — SPF passes there but doesn't align with scienceofscaling.co, so DMARC has to rely on DKIM alignment.
DKIM alignment: all 11 observed emails sign with a domain aligned with scienceofscaling.co (scienceofscaling.co). DKIM authenticates the visible From — supports DMARC directly.
TLS: 0% TLS 1.3, 100% TLS 1.2 (across 6 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.
No additional ESPs authorized in the brand's SPF beyond the confirmed senders above.
Probed: scienceofscaling.co, 20627419m.thehustle.co
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 | 9 | 81.8% |
| promotions | 2 | 18.2% |
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 % |
|---|---|---|---|---|---|
| HubSpot | 11 | 81.8% | 18.2% | 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 scienceofscaling.co has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 158.247.31.255 | bid49ch.20627419m.thehustle.co |
3 | 3 | Check → |
| 158.247.31.66 | bid4868.20627419m.thehustle.co |
2 | — | Check → |
| 158.247.31.241 | bid49b3.20627419m.thehustle.co |
2 | — | Check → |
| 158.247.31.101 | bid4877.20627419m.thehustle.co |
1 | — | Check → |
| 158.247.31.205 | bid49a3.20627419m.thehustle.co |
1 | — | Check → |
| 158.247.31.212 | bid49ba.20627419m.thehustle.co |
1 | — | Check → |
| 158.247.25.143 | bid472p.20627419m.thehustle.co |
1 | — | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
scienceofscaling.co | HubSpot 11 |