The problem with one-size-fits-all
Preview text: Two founders saw a better way to approach protein.

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- Subject
- The problem with one-size-fits-all
- Preview text
- Two founders saw a better way to approach protein.
- From
- hello@
gainful.com - Brand
- Gainful
- ESP
- Klaviyo
- Sent
- Fri Oct 9, 2026, 6:04 PM ET
- Sent to
- Colombia (gainful.co), gainful.com
- Size
- 32 KB
- Images
- 10
- Links
- 10, 1 of them buttons
- Subject length
- 34 characters
Against Gainful's usual
Sent in the 6 PM hour, which holds 14% of its emails; 30% arrive in the 5 PM hour. The subject is 34 characters, the same as its average.
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
- Gainful <[email protected]>
- Subject
- The problem with one-size-fits-all
- Date
- Fri, 09 Oct 2026 22:04:01 +0000 (UTC)
- Message-ID domain
- geopod-ismtpd-60
- Return-Path domain
- send.gainful.com
- DKIM signature
- d=gainful.com s=s1
- List-Unsubscribe
- Present, one-click
Servers it passed through, newest first
- by recvd-…-x65b7 with SMTP
- from (unnamed) by geopod-ismtpd-60 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 12, 2026 4:50 PM | More protein. Less of the extras. | |
| Oct 11, 2026 5:39 PM | Whey vs. plant: does it really matter? | |
| Oct 10, 2026 3:45 PM | Your protein powder can do this? | |
| Oct 9, 2026 6:04 PM | The problem with one-size-fits-all (this email) | |
| Oct 8, 2026 4:50 PM | How much protein do you actually need? | |
| Oct 7, 2026 6:14 PM | How much protein do you actually need? | |
| Oct 6, 2026 5:27 PM | “This is a game changer” |
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