The Science of Speed: Concept #2

Preview text: Swing Fast the Right Way

Thursday, Oct 15, 2026 at 5:03 AM EasternKlaviyo

The Stack SystemThe Science of Speed: Concept #2

Fit to screenFull size

The Science of Speed: Concept #2 - email from The Stack System

Using this email in an article? Credit: The Stack System email via They Sent It, with a link to this page. Full-size image

Subject: The Science of Speed: Concept #2
Preview text: Swing Fast the Right Way
From: info@thestacksystem.com
Brand: The Stack System
ESP: Klaviyo
Sent: Thu Oct 15, 2026, 5:03 AM ET
Size: 91 KB
Images: 9
Links: 5, 2 of them buttons
Subject length: 32 characters

Against The Stack System's usual

Sent in the 5 AM hour, which holds 3% of its emails; 40% arrive in the 11 AM hour. The subject is 32 characters; its average is 34.

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 Stack System <[email protected]>
Subject: The Science of Speed: Concept #2
Date: Thu, 15 Oct 2026 09:03:50 +0000
Message-ID domain: klaviyomail.com
Return-Path domain: k3.send.thestacksystem.com
DKIM signature: d=shared.klaviyomail.com s=def1; d=send.thestacksystem.com s=mtd1
List-Unsubscribe: Present, one-click

Servers it passed through, newest first

from (unnamed) by kmta-mta-blue-….servers.clovesoftware.com with SMTP

Other sending headers (names only): X-Mailer-Info-Extra2, X-Mailer-Info, X-Mailer-Info-Extra, X-Kmail-Account, X-Kmail-Flow, X-Kmail-Message, X-Kmail-Ops, X-Report-Abuse

Report this email

Sent just before and after

	Oct 17, 2026 11:34 AM	Built on Science. Backed by Data.
	Oct 17, 2026 4:03 AM	The Science of Speed: Concept #3
	Oct 16, 2026 12:33 PM	You've Unlocked Early Stack Friday Deals!
	Oct 15, 2026 5:03 AM	The Science of Speed: Concept #2 (this email)
	Oct 13, 2026 1:10 AM	The Science of Speed: Concept #1
	Oct 12, 2026 11:05 AM	TheStack Is Changing How Softball Players Train
	Oct 8, 2026 12:43 PM	Join TheStack, Get a FREE Stack Tripod