Bi Yu uses Klaviyo — ESP Tracker

Bi Yu uses Klaviyo as their primary email service provider. Their email authentication setup is good (score 73/100). Missing: DMARC enforcement.

Marketing ESP

Klaviyo

Total observations7

Active days2

Avg per active day3.5

Last activity💤 Dormant · 8 weeks ago

Cadence~every 3 days

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Compare Bi Yu with another brand:

Email setup 73/100

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.

✓

Solid setup, room to improve

Most authentication signals are present. A couple of pieces would tighten things up.

73/100

SPF

pass

DKIM

pass

DMARC

pass (none)

BIMI

none

Unsubscribe

one-click

SPF lookups 2/10

Authentication

DMARC reports sent to bi-yu.nl. Policy p=none is monitor-only — receivers won't act on spoofing yet.

Other ESPs detected

Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).

None — only the primary ESP(s) shown above

Confirmed senders

ESPs 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.

Klaviyo ✓ via sending IP

Other SPF authorizations

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.

Google Workspace

Probed: bi-yu.nl

Where emails landed (Gmail)

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	7	100.0%

ESP activity over time

Apr 30 – May 4, 2026 · 5 days with sends

Last 30d Last 90d

By ESP By inbox/spam

Daily observations per ESP. Brands often run multiple ESPs concurrently — marketing on one, transactional on another — so this chart shows usage rather than switches.

Klaviyo

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Sending IPs

IP addresses bi-yu.nl has been observed sending from, and where their mail landed in Gmail.

IP	Hostname	Obs	Reputation
149.72.226.45	`o1400.shared.klaviyomail.com`	2	Check →
149.72.95.9	`o1398.shared.klaviyomail.com`	1	Check →
149.72.197.103	`o1375.shared.klaviyomail.com`	1	Check →
168.245.31.178	`o1328.shared.klaviyomail.com`	1	Check →
167.89.100.92	`o1308.shared.klaviyomail.com`	1	Check →
168.245.125.63	`o1401.shared.klaviyomail.com`	1	Check →

Per-IP inbox / promotions / spam is being collected and will appear here as new emails are observed.

Sending domains

Domain	ESPs detected	Delivery (7d)
`bi-yu.nl`	Klaviyo 7