The Dual Purpose of Your Eye's Filter

Preview text: Your Eye's Built-In Filter Has a Second Job THE DEFENSE DIGEST Your Eye's Built-In Filter…

NADefenseWednesday, Sep 23, 2026 at 9:37 AM EasternKlaviyo
NADefenseThe Dual Purpose of Your Eye's Filter
Subject
The Dual Purpose of Your Eye's Filter
Preview text
Your Eye's Built-In Filter Has a Second Job THE DEFENSE DIGEST Your Eye's Built-In Filter…
From
jake@nadefense.com
Sent
Wed Sep 23, 2026, 9:37 AM ET
Sent to
mysightguard.com
Size
30 KB
Images
5
Links
5, 4 of them buttons
Subject length
37 characters

Against NADefense's usual

Sent in its busiest hour, 9 AM, which holds 43% of its emails. The subject is 37 characters; its average is 39.

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
NADefense Team <[email protected]>
Subject
The Dual Purpose of Your Eye's Filter
Date
Wed, 23 Sep 2026 13:37:44 +0000
Message-ID domain
klaviyomail.com
Return-Path domain
k3.send.nadefense.com
DKIM signature
d=shared.klaviyomail.com s=def1; d=send.nadefense.com s=mtd1
List-Unsubscribe
Present, one-click

Servers it passed through, newest first

  1. 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 14, 2026 12:27 AMLet’s Empower Your Vision Together
Oct 5, 2026 9:39 AMGinkgo and Your Eye
Sep 29, 2026 9:37 AMWalking May Do Something Your Eye Drops Cannot
Sep 23, 2026 9:37 AMThe Dual Purpose of Your Eye's Filter (this email)
Sep 17, 2026 9:35 AMWhat Keeps a Retina Running for 400 Years?
Sep 11, 2026 9:34 AMAn Eye Exam That Reads More Than Your Vision
Sep 5, 2026 9:34 AMNew Hope for Dry AMD

More from NADefense

All NADefense emails

Get the Black Friday insights

We're collecting every Black Friday email from more than 50,000 brands as it lands. Get what we find: who starts first, the biggest discounts, and the subject lines that stand out.

Free. Unsubscribe anytime.