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chungheehwang's avatar
chungheehwang
Copper Contributor
Feb 03, 2025

How to Remove "on behalf of" from the Sender Information in Emails

Hello, I am using Outlook for Mac Version 16.93 (25011212).

When sending emails to a Google Group, the phrase "on behalf of" appears in the sender information of emails received by group members, as shown in the image below. This prevents Outlook rules from being applied correctly, causing inconvenience. I would like to understand in which situations the "on behalf of" phrase appears and whether there are any settings in Outlook or Google Groups that can prevent this from happening.

According to internal staff, this issue is also reproducible in Outlook for Windows.

I assumed the issue began after configuring SPF, DKIM, and DMARC, but it continues to persist even after those settings were reverted.

 

 

Email Source:

Received: by 2002:a5d:6a90:0:b0:382:29c9:7147 with SMTP id s16csp1500395wru;
        Sun, 2 Feb 2025 23:17:00 -0800 (PST)
Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69])
        by mx.google.com with SMTPS id 98e67ed59e1d1-2f848a69215sor7248749a91.5.2025.02.02.23.16.59
        for <hwangchunghee@(hidden).com>
        (Google Transport Security);
        Sun, 02 Feb 2025 23:16:59 -0800 (PST)
Received: by 2002:a17:90a:ca8a:b0:2e7:8a36:a9b7 with SMTP id
 98e67ed59e1d1-2f845de7c17ls4485422a91.1.-pod-prod-03-us; Sun, 02 Feb 2025
 23:16:58 -0800 (PST)
Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41])
        by mx.google.com with SMTPS id 98e67ed59e1d1-2f848a4f1ccsor7253478a91.3.2025.02.02.23.16.58
        for <grouptest@(hidden).com>
        (Google Transport Security);
        Sun, 02 Feb 2025 23:16:58 -0800 (PST)
From: CH Hwang <(hidden)@gmail.com>
To: "grouptest@(hidden).com" <grouptest@(hidden).com>
Subject: To Group Mail Test
Thread-Topic: To Group Mail Test
Thread-Index: AWc0eDZyel6wZQ1tMWGUauPudi4fgQ==
Sender: "grouptest@(hidden).com" <grouptest@(hidden).com>
X-MS-Exchange-MessageSentRepresentingType: 2
Date: Mon, 3 Feb 2025 07:16:46 +0000
Message-ID:
<CADefdDPaCr+3SD=email address removed for privacy reasons>
List-Help:
<https://support.google.com/a/(hidden).com/bin/topic.py?topic=25838>,
 <mailto:grouptest+help@(hidden).com>
List-Subscribe:
<https://groups.google.com/a/(hidden).com/group/grouptest/subscribe>,
 <mailto:grouptest+subscribe@(hidden).com>
List-Unsubscribe:
<mailto:email address removed for privacy reasons>,
 <https://groups.google.com/a/(hidden).com/group/grouptest/subscribe>
Content-Language: en-US
X-MS-Has-Attach:
X-Auto-Response-Suppress: All
X-MS-Exchange-Organization-SCL: -1
X-MS-TNEF-Correlator:
X-MS-Exchange-Organization-RecordReviewCfmType: 0
received-spf: pass (google.com: domain of (hidden)@gmail.com designates
 209.85.220.41 as permitted sender) client-ip=209.85.220.41;
Content-Type: multipart/alternative;
boundary="_000_CADefdDPaCr3SDc8o6DUEpYTMvSx3CYGmaGEC4H8zEz4R79gmailgma_"
MIME-Version: 1.0
 
--_000_CADefdDPaCr3SDc8o6DUEpYTMvSx3CYGmaGEC4H8zEz4R79gmailgma_
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
 
VG8gR3JvdXAgTWFpbCBUZXN0DQo=
 
--_000_CADefdDPaCr3SDc8o6DUEpYTMvSx3CYGmaGEC4H8zEz4R79gmailgma_
Content-Type: text/html; charset="utf-8"
Content-ID: <1F1CA238C46CC244BF75EAD107388CE9@1>
Content-Transfer-Encoding: base64
 
PGh0bWw+DQo8aGVhZD4NCjxtZXRhIGh0dHAtZXF1aXY9IkNvbnRlbnQtVHlwZSIgY29udGVudD0i
dGV4dC9odG1sOyBjaGFyc2V0PXV0Zi04Ij4NCjwvaGVhZD4NCjxib2R5Pg0KPGRpdiBkaXI9Imx0
ciI+VG8gR3JvdXAgTWFpbCBUZXN0PC9kaXY+DQo8L2JvZHk+DQo8L2h0bWw+DQo=
 
--_000_CADefdDPaCr3SDc8o6DUEpYTMvSx3CYGmaGEC4H8zEz4R79gmailgma_--

 

 

SPF Settings:

"v=spf1 include:_spf.google.com include:amazonses.com ~all"

 

DKIM Settings:

""v=DKIM1; k=rsa; p=(hidden)"

 

DMARC Settings:

"v=DMARC1; p=none; rua=mailto:${report_mail}; ruf=mailto:${report_mail}; fo=1"

on behalf of
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