50% off a routine upgrade ends TODAY!
Preview text: Take care of you now.

Using this email in an article? Credit: Proto-col email via They Sent It, with a link to this page. Full-size image
- Subject
- 50% off a routine upgrade ends TODAY!
- Preview text
- Take care of you now.
- From
- hello@
proto-col.com - Brand
- Proto-col
- ESP
- Klaviyo
- Sent
- Tue May 26, 2026, 3:00 AM ET
- Sent to
- United Kingdom (proto-col.co.uk), proto-col.com
- Size
- 76 KB
- Images
- 18
- Links
- 24, 11 of them buttons
- Subject length
- 37 characters
Against Proto-col's usual
Sent in the 3 AM hour, which holds 3% of its emails; 43% arrive in the 5 AM hour. The subject is 37 characters; its average is 38.
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
- Proto-col <[email protected]>
- Subject
- 50% off a routine upgrade ends TODAY!
- Date
- Tue, 26 May 2026 07:00:19 +0000 (UTC)
- Message-ID domain
- geopod-ismtpd-26
- Return-Path domain
- engage.proto-col.com
- DKIM signature
- d=proto-col.com s=kl2
- List-Unsubscribe
- Present, one-click
Servers it passed through, newest first
- from o1280.shared.klaviyomail.com [167.89.72.22] by our receiving server with ESMTPS
- by recvd-…-h9tk9 with SMTP
- from (unnamed) by geopod-ismtpd-26 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
| Jun 5, 2026 5:00 AM | Where your collagen comes from matters | |
| May 30, 2026 5:00 AM | Are you taking the right collagen for your goal? | |
| May 28, 2026 12:00 PM | Unlock your energy with hydration | |
| May 26, 2026 3:00 AM | 50% off a routine upgrade ends TODAY! (this email) | |
| May 25, 2026 5:00 AM | Your 50% off ends tomorrow! | |
| May 22, 2026 5:30 AM | Your routine, upgraded. 50% off for this weekend only. | |
| May 19, 2026 12:00 PM | What your hair is trying to tell you |
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