They Sent It

don't open this tomorrow

Custom ClubMonday, Sep 28, 2026 at 12:02 PM EasternKlaviyo
Custom Clubdon't open this tomorrow
Subject
don't open this tomorrow
From
club@cstmclub.com
Sent
Mon Sep 28, 2026, 12:02 PM ET
Sent to
customstud1os.com
Size
10 KB
Images
1
Links
2, 1 of them buttons
Subject length
24 characters

Against Custom Club's usual

Sent in its busiest hour, 12 PM, which holds 10% of its emails. The subject is 24 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
Max from Custom Club <[email protected]>
Subject
don't open this tomorrow
Date
Mon, 28 Sep 2026 16:02:38 +0000 (UTC)
Message-ID domain
geopod-ismtpd-51
Return-Path domain
k1.vip.cstmclub.com
DKIM signature
d=vip.cstmclub.com s=s1
List-Unsubscribe
Present, one-click

Servers it passed through, newest first

  1. by recvd-…-9cd6r with SMTP
  2. from (unnamed) by geopod-ismtpd-51 with HTTP

Other sending headers (names only): X-Kmail-Account, X-Kmail-Message, X-Kmail-Ops, X-Report-Abuse, X-SG-EID, X-SG-ID, X-Entity-ID

Report this email

Sent just before and after

Oct 9, 2026 4:30 AMExclusive access to the Archive Sale
Oct 2, 2026 4:30 AMwe need to talk about the pants
Sep 30, 2026 3:02 AMwhat you didn't see
Sep 28, 2026 12:02 PMdon't open this tomorrow (this email)
Sep 27, 2026 11:04 AMYOUR EARLY ACCESS PASSWORD
Sep 26, 2026 11:04 AMearly access opens in 24 hours
Sep 24, 2026 2:04 AMhow to actually get one

More from Custom Club

All Custom Club emails

Sent the same day by similar brands

Same ESP and the closest weekly volume, sent on Sep 28, 2026.

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.