The Science of Bright Light

Preview text: The strongest signal your body clock has

Sunday Light

Friday, Oct 16, 2026 at 6:03 AM EasternKlaviyo

Sunday LightThe Science of Bright Light

Fit to screenFull size

The Science of Bright Light - email from Sunday Light

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

Use this example

Download imageMore for writers

Subject: The Science of Bright Light
Preview text: The strongest signal your body clock has
From: enquiries@sundaylight.cc
Brand: Sunday Light
ESP: Klaviyo
Sent: Fri Oct 16, 2026, 6:03 AM ET
Size: 50 KB
Images: 21
Links: 21, 5 of them buttons
Subject length: 27 characters

Against Sunday Light's usual

Sent in the 6 AM hour, which holds 14% of its emails; 48% arrive in the 7 AM hour. The subject is 27 characters; its average is 29.

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: Sunday Light <[email protected]>
Subject: The Science of Bright Light
Date: Fri, 16 Oct 2026 10:03:21 +0000
Message-ID domain: klaviyomail.com
Return-Path domain: k3.send.sundaylight.cc
DKIM signature: d=shared.klaviyomail.com s=def1; d=send.sundaylight.cc s=mtd1
List-Unsubscribe: Present, one-click

Servers it passed through, newest first

from (unnamed) by kmta-mta-green-….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 21, 2026 6:02 AM	Living with Sunday
	Oct 18, 2026 6:06 AM	Engineering Indoor Sunlight
	Oct 16, 2026 12:04 PM	"The healthiest light for your home"
	Oct 16, 2026 6:03 AM	The Science of Bright Light (this email)
	Oct 14, 2026 4:41 AM	Welcome to Sunday Light
	Sep 25, 2026 1:01 PM	As featured in Air Mail
	Sep 21, 2026 7:10 AM	More than a light