Caffeine is easy. Sustained performance is harder.
Preview text: A good pre-workout should do more than just wake you up.

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- Subject
- Caffeine is easy. Sustained performance is harder.
- Preview text
- A good pre-workout should do more than just wake you up.
- From
- derek@
prbreaker.com - Brand
- Pr-Breaker
- ESP
- Klaviyo
- Sent
- Wed Sep 23, 2026, 1:06 PM ET
- Size
- 26 KB
- Images
- 5
- Links
- 5, 4 of them buttons
- Subject length
- 50 characters
Against Pr-Breaker's usual
Sent in the 1 PM hour, which holds 13% of its emails; 29% arrive in the 8 AM hour. The subject is 50 characters; its average is 40.
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
- Derek from PR-BREAKER <[email protected]>
- Subject
- Caffeine is easy. Sustained performance is harder.
- Date
- Wed, 23 Sep 2026 17:06:39 +0000 (UTC)
- Message-ID domain
- geopod-ismtpd-41
- Return-Path domain
- k1.send.prbreaker.com
- DKIM signature
- d=send.prbreaker.com s=s1
- List-Unsubscribe
- Present, one-click
Servers it passed through, newest first
- by recvd-…-n2md5 with SMTP
- from (unnamed) by geopod-ismtpd-41 with HTTP
Other sending headers (names only): X-Kmail-Account, X-Kmail-Message, X-Kmail-Ops, X-Report-Abuse, X-SG-EID, X-SG-ID, X-Entity-ID
Sent just before and after
| Oct 8, 2026 1:15 PM | Most brands hide their formulas. We don't. | |
| Oct 7, 2026 8:37 AM | FLASH SALE: GRAPE MATERIA FOR $20 | |
| Sep 25, 2026 9:09 AM | 3g glycine before bed: what the research found | |
| Sep 23, 2026 1:06 PM | Caffeine is easy. Sustained performance is harder. (this email) | |
| Sep 17, 2026 1:07 PM | TRY MOONIRA RISK-FREE | |
| Sep 15, 2026 2:09 PM | I really want you to try MOONIRA | |
| Sep 11, 2026 10:11 AM | What MOONIRA Actually Does (The Short Version) |
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