The White T-Shirt Test

Preview text: Most fail. This one doesn’t.

Sunday, Apr 26, 2026 at 10:45 AM EasternKlaviyo

The Classic T-ShirtThe White T-Shirt Test

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Against The Classic T-Shirt's usual

Sent in the 10 AM hour, which holds 3% of its emails; 71% arrive in the 11 AM hour. The subject is 22 characters; its average is 33.

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 o1380.shared.klaviyomail.com [149.72.196.98] by our receiving server with ESMTPS
by recvd-…-dlxdk with SMTP
from (unnamed) by geopod-ismtpd-56 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

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