Mail Stay uses Mailgun

Mail Stay uses Mailgun as their primary email service provider. Their email authentication setup is good (score 73/100). Missing: DMARC enforcement, one-click unsubscribe.

Transactional ESP

Mailgun

Total observations3

Active days1

Avg per active day3.0

Last activity📬 Active · 2 days ago

Cadenceone-off

Other technologies

Non-ESP tools detected in this brand's emails. Independent of who sends — a brand can use any combination.

HTML builder

Unlayer

Compare Mail Stay 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

missing

SPF lookups 1/10

SPF / DKIM / DMARC above reflect the last 3 emails we've observed. DMARC policy is read live from DNS.

Authentication

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

SPF alignment: all 3 observed emails use a return-path aligned with mail-stay.ai (mg.mail-stay.ai). SPF authenticates the visible From — supports DMARC directly.

DKIM alignment: all 3 observed emails sign with a domain aligned with mail-stay.ai (mg.mail-stay.ai). DKIM authenticates the visible From — supports DMARC directly.

Transport & deliverability

Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 3 sends).

Gmail trust warnings observed

🚩 Suspicious-images banner ("This message appears suspicious") — observed on 3 emails (100% of tracked) · last seen Jun 28, 2026

Gmail's own filter showed these warnings to real subscribers in their inbox — independent of SPF/DKIM/DMARC pass/fail status. A consistent pattern often signals reputation issues or brand-impersonation concerns.

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.

Mailgun ✓ confirmed

Other SPF authorizations

No additional ESPs authorized in the brand's SPF beyond the confirmed senders above.

Probed: mail-stay.ai, mg.mail-stay.ai

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	3	100.0%

Placement by ESP

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 %
Mailgun	3		100.0%	0.0%	0.0%

ESP activity over time

Jun 28 – Jun 28, 2026 · 1 day 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.

⚠

Mailgun ⚠ Gmail warning