The 20-minute rule
Japan has a word for it
Manta Sleep <[email protected]>
Share
Manta Sleep promotes their SOUND Mask and SOUND+ Deep Sleep Bundle, highlighting the concept of Inemuri, the art of sleeping while present. They express gratitude for customer support. The brand invites customers to update their email preferences.
What the raw message shows
From the headers
- Sent with
-
Klaviyo See it in the headers
Across Manta Sleep's email
- Sends
- About 3 a week
- DMARC
-
Not enforced
Failures are monitored but still delivered.
The copy
31 words · under a minute to read
Manta Sleep logo
Inemuri: the art of sleeping while present
Reclaim your rest
Get Manta SOUND Mask
Get SOUND+ Deep Sleep Bundle
To update your email preferences, choose your preferred option:
The words as text: what a screen reader can follow, and all there is when images don't load.
What the headers say
Read from the message's own headers, as it arrived.
- Came from
-
o1405.shared.klaviyomail.com
· 149.72.85.177
Klaviyo's sending servers
- SPF
- Pass for klaviyo.mantasleep.com
- DKIM
-
- Pass signed by mantasleep.com
- DMARC
-
Pass for mantasleep.com
Policy: none, so failures would still be delivered
- Unsubscribe
-
One-click
Meets the Gmail and Yahoo rule for bulk senders.
- Complaints
- No feedback-loop header
Show all 20 headers Hide the headers
As received, minus the delivery side: the archive's own addresses show as [recipient], its mail servers as [receiver], signatures are left out and unsubscribe links trimmed to their host.
Route
- Received Identifies Klaviyo
- from o1405.shared.klaviyomail.com (149.72.85.177) by [receiver] (cloudflare) id vXq15AqtWnyr for <[recipient]>; Wed, 19 Aug 2026 22:45:07 +0000
- Received
- by recvd-597bd976c-swk7x with SMTP id recvd-597bd976c-swk7x-1-6A8631F3-88 2026-08-19 22:45:07.704035275 +0000 UTC m=+1914657.048133561
- Received
- from NTg5NTg1NQ (unknown) by geopod-ismtpd-22 (SG) with HTTP id iEe4-qPiQ7OiS7fD7F1tbg Wed, 19 Aug 2026 22:45:07.668 +0000 (UTC)
Authentication
- Received-SPF Authentication result
- pass ([receiver]: domain of [recipient]@klaviyo.mantasleep.com designates 149.72.85.177 as permitted sender) receiver=[receiver]; client-ip=149.72.85.177; envelope-from="[recipient]@klaviyo.mantasleep.com"; helo=o1405.shared.klaviyomail.com;
- Authentication-Results Authentication result
- [receiver]; dkim=pass header.d=mantasleep.com header.s=kl2 header.b=ShFdb4wh; dmarc=pass header.from=mantasleep.com policy.dmarc=none; spf=none ([receiver]: no SPF records found for [email protected]) smtp.helo=o1405.shared.klaviyomail.com; spf=pass ([receiver]: domain of [recipient]@klaviyo.mantasleep.com designates 149.72.85.177 as permitted sender) smtp.mailfrom=[recipient]@klaviyo.mantasleep.com; arc=none smtp.remote-ip=149.72.85.177
Platform
- X-Kmail-Account
- KYgPD8
- X-Kmail-Message
- 01KZTZ967TH1KF9X04AF6VA51Y
- X-Kmail-Ops
- 01KXF2R3JSH9777JVSMDCCMC6Q
- X-SG-EID
- u001.xeEgffpsmHA1gha/vIlCfnFDCPUYhzR8uskr3qDb2pX8KCnJWbdA3jE6/xdLuuEdy2P4DBV8umCY0uyExloeEY6bFAylMkMpX+FzTp8ZWE7ODQdXO5bYxLRloAesv6C9maTwDJLLptgthJei/Qi8fZqaSpu59qHGwbgjvsyQkM7LE+qMhIwYBdclNQLgzyb9aLFWgWRcovBjezMGFn7JEqUw4uitTe7nv3RiS7VFS38bp16EAe/X73zxvHLSMs0F
- X-SG-ID
- u001.SdBcvi+Evd/bQef8eZF3BiU3Zi1S53GtqGa3TWBmqe75yn5aYrkvkfG+ZGKrHRvq5L1Pw6pZ2fI18+Jq/t9AxY8t7YCTCy7IOdSMatKI1SDTgCpbep8m09siQKtADlG8Xdfgk7EhFv4N5vcSR+QXWwnaVN44MgSAau7YjDGGoP8wirO0f4PcYkLMQCjOFy/3EC6a/J7dchCavbeMI9TLlRSBY0gAmztQnFRqxL/g5FKOoZIxCTLw0aEWvvqrmhmtWlzHmu4D51BzshYQeLQAkWppxczfTi1Bu87glfZidpRk1wJVre3bJKCLJ4NfS3zkVbQM66dDv1UU9OFzp10Ak5B/8G8i5ZLeng07805sfw/vE7yIEdF66WzHm4ay3QTC
- X-Entity-ID
- u001.hfPXRH9Vf9JkJDdd7ZPpgQ==
Unsubscribe and feedback
- List-Unsubscribe
- <https://manage.kmail-lists.com/…>
- List-Unsubscribe-Post
- List-Unsubscribe=One-Click
- X-Report-Abuse
- Please report any spam or abuse to: [email protected]
Message
- Content-Type
- multipart/alternative; boundary=39b6da1d54f49b173d25faf563e952d004d9d9e223d04942714e21892122
- Date
- Wed, 19 Aug 2026 22:45:07 +0000 (UTC)
- From
- Manta Sleep <[email protected]>
- Mime-Version
- 1.0
- Message-ID
- <iEe4-qPiQ7OiS7fD7F1tbg@geopod-ismtpd-22>
- Subject
- The 20-minute rule
More from Manta Sleep
All 37 emailsArchived for reference and commentary. Manta Sleep, its logos and content are the property of their respective owners; Inbox Archive claims no affiliation and has disabled all links. If you own this content and would like it removed, get in touch.