Firm vs. soft for back pain: it depends
Preview text: Firm vs. soft for back pain: it depends 96 Your sleep position and body weight matter more…

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- Subject
- Firm vs. soft for back pain: it depends
- Preview text
- Firm vs. soft for back pain: it depends 96 Your sleep position and body weight matter more…
- From
- info@
send.sleepdoctor.com - Brand
- Sleep Doctor
- ESP
- Klaviyo
- Sent
- Thu Oct 22, 2026, 9:30 AM ET
- Sent to
- americansleepassociation.net, singularsleep.com, sleepassociation.com, sleepassociation.info, sleepdoctor.com, sleepdoctorpm.com, thepowerofwhenquiz.com, thesleepdoctor.com
- Size
- 88 KB
- Images
- 19
- Links
- 36, 8 of them buttons
- Subject length
- 39 characters
Against Sleep Doctor's usual
Sent in its busiest hour, 9 AM, which holds 23% of its emails. The subject is 39 characters; its average is 37.
Email headers
What the brand's servers put on this email. Our receiving servers, the address we subscribed with and unsubscribe links are left out.
- From
- Sleep Doctor <[email protected]>
- Subject
- Firm vs. soft for back pain: it depends
- Date
- Thu, 22 Oct 2026 13:30:06 +0000
- Message-ID domain
- cio151267.send.sleepdoctor.com
- Return-Path domain
- cio151267.send.sleepdoctor.com
- DKIM signature
- d=cio151267.send.sleepdoctor.com s=cio
- List-Unsubscribe
- Present, one-click
- Mailer
- Customer.io (…_ycRxY9o; +https://whatis.customeriomail.com)
Servers it passed through, newest first
- by … with HTTP
Other sending headers (names only): X-Mailgun-Sid, X-Mailgun-Sending-Ip, X-Mailgun-Dkim, X-Mailgun-Native-Send, X-Mailgun-Track-Clicks, X-Mailgun-Track-Opens, X-Report-Abuse-To, X-Mailgun-Variables
Sent just before and after
| Oct 28, 2026 10:00 AM | Better sleep, stronger heart | |
| Oct 26, 2026 10:00 AM | Your Apple Watch can’t see everything | |
| Oct 25, 2026 9:30 AM | Your cozy fall bedroom has a catch | |
| Oct 22, 2026 9:30 AM | Firm vs. soft for back pain: it depends (this email) | |
| Oct 21, 2026 9:30 AM | Home test or lab study: which fits you? | |
| Oct 19, 2026 9:30 AM | Why you wake up earlier after 60 | |
| Oct 18, 2026 9:00 AM | Late-night snacking, minus the guilt |
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Sent the same day by similar brands
Same ESP and the closest weekly volume, sent on Oct 22, 2026.














