The bounce problem
Preview text: This is what ruins runs
- Subject
- The bounce problem
- Preview text
- This is what ruins runs
- From
- support@
endorphinbelt.com - Brand
- Endorphin
- ESP
- Klaviyo
- Sent
- Sat Oct 17, 2026, 6:15 AM ET
- Size
- 39 KB
- Images
- 14
- Links
- 14, 4 of them buttons
- Subject length
- 18 characters
Against Endorphin's usual
Sent in its busiest hour, 6 AM, which holds 26% of its emails. The subject is 18 characters; its average is 26.
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
- The Endorphin Belt <[email protected]>
- Subject
- The bounce problem
- Date
- Sat, 17 Oct 2026 10:15:50 +0000 (UTC)
- Message-ID domain
- geopod-ismtpd-85
- Return-Path domain
- k1.send.endorphinbelt.com
- DKIM signature
- d=send.endorphinbelt.com s=s1
- List-Unsubscribe
- Present, one-click
Servers it passed through, newest first
- by recvd-…-4tltm with SMTP
- from (unnamed) by geopod-ismtpd-85 with HTTP
Other sending headers (names only): X-Kmail-Account, X-Kmail-Flow, X-Kmail-Message, X-Kmail-Ops, X-Report-Abuse, X-SG-EID, X-SG-ID, X-Entity-ID
Sent just before and after
| Oct 20, 2026 6:18 AM | Carry water smarter | |
| Oct 19, 2026 6:17 AM | Belt vs belt | |
| Oct 18, 2026 6:16 AM | You don’t need a vest | |
| Oct 17, 2026 6:15 AM | The bounce problem (this email) | |
| Oct 16, 2026 6:14 AM | Why we made this | |
| Oct 15, 2026 6:13 AM | A free flask, on me | |
| Oct 14, 2026 6:12 AM | Your 10% is waiting |
More from Endorphin
All Endorphin emailsNov 1, 2026 2:00 AM
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Oct 25, 2026 6:23 AM
Oct 25, 2026 4:03 AM
Oct 24, 2026 6:22 AM
Oct 23, 2026 6:21 AM
Run with your dog. Hands free.
Oct 23, 2026 4:02 AM
Oct 22, 2026 6:20 AM
Sent the same day by similar brands
Same ESP and the closest weekly volume, sent on Oct 17, 2026.
