I got an e-mail with From: [email protected]

Hi there,

It hapenned yesterday, I got an e-mail from customer by eMClient and there was identification From: [email protected].
Once tried to reply on this mail, the form To: was empty.
When checking the header of the e-mail, I found From: and Return-path: correctly filled with the customer address.

Does it looks like a bug ?

Thanks for your time and wish you a nice day.

Miroslav Letak

------ Original message ------
From [email protected]
To let@___.cz
Date 02.02.2026 13:16:09
Subject: Re: [JIRA] (SD-4870) New customer Hap___ 25GE TTC

Header:
Return-Path: <info@hap____.net>
From: info@hap___.net <info@hap___.net>
To: let@___.cz