Offer of the week:
Preview text: Offer of the week: Your favourite bundles with an extra 10% off.

Using this email in an article? Credit: Proto-col email via They Sent It, with a link to this page. Full-size image
- Subject
- Offer of the week:
- Preview text
- Offer of the week: Your favourite bundles with an extra 10% off.
- From
- hello@
proto-col.com - Brand
- Proto-col
- ESP
- Klaviyo
- Sent
- Thu Oct 1, 2026, 5:00 AM ET
- Sent to
- United Kingdom (proto-col.co.uk), proto-col.com
- Size
- 81 KB
- Images
- 23
- Links
- 26, 3 of them buttons
- Subject length
- 18 characters
Against Proto-col's usual
Sent in its busiest hour, 5 AM, which holds 43% of its emails. The subject is 18 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
- Already reduced by up to 60%. Save another 10% with OFFER10. <[email protected]>
- Subject
- Offer of the week:
- Date
- Thu, 01 Oct 2026 09:00:40 +0000 (UTC)
- Message-ID domain
- geopod-ismtpd-2
- 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
- by recvd-…-5pfb9 with SMTP
- from (unnamed) by geopod-ismtpd-2 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 5:00 AM | Menopause changes your collagen. Here's what to do about it. | |
| Oct 9, 2026 5:00 AM | How to look after your knees. | |
| Oct 1, 2026 8:47 AM | Your saved products are about to expire! | |
| Oct 1, 2026 5:00 AM | Offer of the week: (this email) | |
| Sep 30, 2026 10:46 AM | We've saved these for you! | |
| Sep 30, 2026 5:00 AM | Save £16.47 a month, whichever collagen you choose | |
| Sep 25, 2026 5:00 AM | 20% Off everything. Yes Everything. |
More from Proto-col
All Proto-col emailsYour saved products are about to expire!
Nov 2, 2026 7:47 AM
Nov 1, 2026 9:47 AM
Cushion your knees, hips and shoulders
Nov 1, 2026 4:01 AM
Your discount is about to expire!
Oct 27, 2026 7:04 PM
Your saved products are about to expire!
Oct 25, 2026 10:09 PM
Oct 25, 2026 12:09 AM
Discover how we're making a difference...
Oct 24, 2026 7:03 PM
Oct 22, 2026 6:47 AM
Sent the same day by similar brands
Same ESP and the closest weekly volume, sent on Oct 1, 2026.









