What Keeps a Retina Running for 400 Years?

Preview text: What Keeps a Retina Running for 400 Years? THE DEFENSE DIGEST What Keeps a Retina Running…

NADefenseThursday, Sep 17, 2026 at 9:35 AM EasternKlaviyo
NADefenseWhat Keeps a Retina Running for 400 Years?
Subject
What Keeps a Retina Running for 400 Years?
Preview text
What Keeps a Retina Running for 400 Years? THE DEFENSE DIGEST What Keeps a Retina Running…
From
jake@nadefense.com
Sent
Thu Sep 17, 2026, 9:35 AM ET
Sent to
mysightguard.com
Size
30 KB
Images
5
Links
5, 4 of them buttons
Subject length
42 characters

Against NADefense's usual

Sent in its busiest hour, 9 AM, which holds 43% of its emails. The subject is 42 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
What Keeps a Retina Running for 400 Years?
Date
Thu, 17 Sep 2026 13:35:51 +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 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
Sep 17, 2026 9:35 AMWhat Keeps a Retina Running for 400 Years? (this email)
Sep 11, 2026 9:34 AMAn Eye Exam That Reads More Than Your Vision
Sep 5, 2026 9:34 AMNew Hope for Dry AMD
Aug 30, 2026 9:33 AMThe Surprising Link Between Your Gut and Your Vision

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. You'll get a confirmation email first, and you can unsubscribe anytime.