Doctors call it the fifth vital sign

Preview text: Are you tracking it? 🤔

Fri Period

Friday, Sep 11, 2026 at 2:15 PM EasternKlaviyo

Fri PeriodDoctors call it the fifth vital sign

Fit to screenFull size

Doctors call it the fifth vital sign - email from Fri Period

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

Use this example

Download imageMore for writers

Subject: Doctors call it the fifth vital sign
Preview text: Are you tracking it? 🤔
From: hello@friperiod.com
Brand: Fri Period
ESP: Klaviyo
Sent: Fri Sep 11, 2026, 2:15 PM ET
Size: 39 KB
Images: 3
Links: 3, 1 of them buttons
Subject length: 36 characters

Against Fri Period's usual

Sent in its busiest hour, 2 PM, which holds 26% of its emails. The subject is 36 characters; its average is 30.

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: Nina | Fri Period <[email protected]>
Subject: Doctors call it the fifth vital sign
Date: Fri, 11 Sep 2026 18:15:06 +0000
Message-ID domain: klaviyomail.com
Return-Path domain: k3.send.friperiod.com
DKIM signature: d=shared.klaviyomail.com s=def1; d=send.friperiod.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-Message, X-Kmail-Ops, X-Report-Abuse

Report this email

Sent just before and after

	Sep 22, 2026 2:30 PM	Your period is helping clean the ocean!
	Sep 19, 2026 11:15 AM	These reviews keep me up at night 😱
	Sep 15, 2026 2:03 PM	Period underwear.
	Sep 11, 2026 2:15 PM	Doctors call it the fifth vital sign (this email)
	Sep 8, 2026 2:15 PM	Periods cost you $18,000 in a lifetime
	Sep 4, 2026 1:06 PM	Name our new product and win $200!
	Sep 1, 2026 1:30 PM	Happy birthday to us!🥳