For me this has been an area where you just see wildly different expectations from other mail admins than you do from customers. And not just shady customers or anything like that. A lot of people find themselves targets of just generally mean spirited people who want to ruin them for the slightest thing. So by writing the original sender IP you get “Why would you do that? This is unacceptable” from the customer. Meanwhile you get “Why wouldn’t you do that? This is unacceptable” from fellow admins.

A common reason cited by my customers is that they run websites that send email, and they intentionally go out of their way to hide the server IP because they’re big DDOS targets. These attackers will register just to view the headers and find anything they can use to further their attacks. They’re relentless, viscous, and seemingly jobless when they find a target.

And again it’s not just people being shady. You really only have to exist to become someone’s target these days. These attackers aren’t all okay, they don’t all need a justification that anyone else can see. Grandma’s recipe blog sets them off because “chicken” was an ingredient.

So that’s a bit why we keep that info to ourselves. Our customers demand it, not doing it increases chargebacks and bad reviews. We take responsibility for what our customers send and we rain down hellfire on anyone who tries to abuse our trust.

On 2026-05-21 11:12, Michael Peddemors via mailop wrote:
A pet Peeve..

First of all.. this practice of obfuscating originating IP address, only hurts the email operator..

Received: from [HIDDEN] (Authenticated sender: [email protected]) by omf05.b.hostedemail.com (Postfix) with ESMTPA id 11507A0004;
        Thu, 21 May 2026 15:34:18 +0000 (UTC)

(Compromised account btw)

If the IP was actually shown, we could detect if the source is a known threat actor..

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lycos.com; h=mime-version:date:from:to:subject:message-id:content-type; s=lycos-com; bh=JiODEPPTiOrNEaAyHOE0d9u95p4740eXUFnox6qes2Y=; b=gFFhkkS3gqQgQNJ02y7GNthzAN+2HEcTAYmIgIRQ/j9Ov9ryxnG+kRxM9/16aVeAHVYxZPX/afnMg26lDy+KJF6Fg0+py3RqL63nN1wLdB35L+RNj/SLh1LQ09trJQAs2IG+TIvKwi0dzVr6xa3aPC4ESPfQmo/VLaSgj0AsgBo=

X-HE-Meta: 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

My complaint is exemplified by these long headers.. When did it become okay to stop folding headers??
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