Which uses Salesforce MC as their primary email service provider. They're the #10,415 most-visited website overall, per Tranco (a web-popularity measure, not an email one). Their email authentication setup is good (score 80/100).
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 10 emails we've observed. DMARC policy is read live from DNS.
DMARC reports sent to DMARC Analyzer (Mimecast). Policy
p=quarantine means receivers actively block or quarantine spoofed mail.
SPF alignment: all 39 observed emails use a return-path aligned with which.co.uk (bounce.mail.which.co.uk). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 33 observed emails sign with a domain aligned with which.co.uk (mail.which.co.uk). DKIM authenticates the visible From — supports DMARC directly.
TLS: 12% TLS 1.3, 88% TLS 1.2 (across 17 sends).
2 of 7 emails in the last 7 days were delayed beyond 5 minutes (29%) — delays stayed within 5–15 minutes. Slow sends averaged 7 min 20 sec, peaked at 9 min 1 sec. 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).
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: which.co.uk, bounce.mail.which.co.uk, mail.which.co.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 | 47 | 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 % |
|---|---|---|---|---|---|
| Salesforce MC | 39 | 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 which.co.uk has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 68.232.200.77 | mta.mail.which.co.uk |
47 | 10 | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
mail.which.co.uk | Salesforce MC 47 | 🐢 2/7 slow (avg 5 min 18 sec, peak 9 min 1 sec) |
