Companieshouse uses Amazon SES as their primary email service provider. They rank #20,255 in the Tranco list of most-popular domains. Their email authentication setup is good (score 80/100).
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 service.gov.uk. Policy
p=quarantine means receivers actively block or quarantine spoofed mail.
SPF alignment: all 18 observed emails use a return-path aligned with companieshouse.gov.uk (us-east.news.companieshouse.gov.uk). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 18 observed emails sign with a domain aligned with companieshouse.gov.uk (news.companieshouse.gov.uk). DKIM authenticates the visible From — supports DMARC directly.
TLS: modern — 100% TLS 1.3 (across 11 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 2 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: companieshouse.gov.uk, us-east.news.companieshouse.gov.uk, news.companieshouse.gov.uk
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 | 17 | 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 | 16 | 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 companieshouse.gov.uk has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 66.179.17.202 | mailer017202.govd3.service.govdelivery.com |
5 | 3 | Check → |
| 66.179.19.15 | mailer019015.govdeliveryservice.com |
3 | — | Check → |
| 66.179.17.65 | mailer017065.govd2.service.govdelivery.com |
2 | — | Check → |
| 66.179.17.70 | mailer017070.govd2.service.govdelivery.com |
2 | — | Check → |
| 66.179.17.86 | mailer017086.govd2.service.govdelivery.com |
2 | — | Check → |
| 66.179.19.61 | mailer019061.govd2.service.govdelivery.com |
2 | 2 | Check → |
| 66.179.19.94 | mailer019094.govd2.service.govdelivery.com |
1 | — | Check → |
| 66.179.17.193 | mailer017193.govd3.service.govdelivery.com |
1 | — | Check → |
| 66.179.17.237 | mailer017237.govd3.service.govdelivery.com |
1 | — | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
news.companieshouse.gov.uk | Amazon SES 18 |
