I received this email from a MailChimp campaign and would like to know the meaning of "X-MC-User". Is it the owner of the account that is sending me the email? The specific header entry is:

X-MC-User: cfb37e41050726c424019265b

Here is the full header for review:

From: ...
Message-ID: <tl71.mcdlv.net>
X-Mailer: MailChimp Mailer - CIDc40ee845e433f8bc0c14
X-Campaign: mailchimpcfb37e41050726c424019265b.c40ee845e4
X-campaignid: mailchimpcfb37e41050726c424019265b.c40ee845e4
X-Report-Abuse: Please report abuse for this campaign here:
X-MC-User: cfb37e41050726c424019265b
Feedback-ID: 96911361:96911361.93855:us18:mc
List-ID: cfb37e41050726c424019265bmc list
X-Accounttype: pd
X-Original-Sender: ...
List-Unsubscribe: https://...-manage.com/unsubscribe?u=cfb37e41050726c424019265b&id=3a3b197724&e=33f8bc0c14&c=c40ee845e4>, 
List-Unsubscribe-Post: List-Unsubscribe=One-Click
x-mcda: FALSE
Content-Type: multipart/alternative; boundary="_----------
MIME-Version: 1.0

closed as off-topic by Ignacio Vazquez-Abrams, JakeGould, robinCTS, bertieb, Pimp Juice IT Jul 6 '18 at 22:06

  • This question does not appear to be about computer software or computer hardware within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.


Internet packet headers (including email and HTTP requests headers) that are prefixed with X- indicate that they are non-standard; they are made up by a particular piece of email software (or perhaps by a user).

Making an inference from the rest of the headers, X-MC-User refers to the MailChimp user that sent you that email as part of a campaign.

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