Your message to -hk_premier_support@lenovo.com couldn't be delivered.

The group -hk_premier_support only accepts messages from people in its organization or on its allowed senders list, and your email address isn't on the list.

yyc Office 365 -hk_premier_support Sender Action Required Sender not allowed

How to Fix It It appears you aren't in the same organization as the group (or a sub-group) you're sending to or your email address isn't on the group's allowed senders list. Ask the owner of the group to grant you permission to send to it, and then try again. If the group belongs to a different organization than yours, contact the organization's customer service department for assistance. If the group is in your organization and you don't know who the group owner is, you can find it by doing the following in either Outlook on the web or Outlook: Open your Sent folder and select the original message. If you're using Outlook on the web, select the group name located on the To or CC line. If you're using Outlook, double-click the group name located on the To or CC line. In Outlook on the web, from the pop-up dialog box, choose Owner. In Outlook, choose Contact. The owner's name is listed under Owner. The owner of the group may have intentionally chosen to restrict who can send messages to it, and they may not want to adjust the existing restriction. In this case, you'll have to contact the group members by some other means, such as sending an email message to their individual email addresses or contacting them by phone.

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More Info for Email Admins

Status code: 550 5.7.133 This error occurs when the distribution group, security group, or Microsoft 365 group is configured to accept messages only from authenticated senders (senders in the same organization or those added to the group's allowed senders list).To fix the issue, the recipient's email admin or the group owner must add the sender's email address to the group's allowed senders list or change the group's delivery management setting to accept messages from senders inside and outside of the organization.Usually this issue can only be fixed by the recipient's email admin or the group owner.For more information and steps to fix this error, see Fix email delivery issues for error code 5.7.133 in Office 365.

Original Message Details

Created Date: 6/16/2026 3:02:31 PM Sender Address: yyc@hichain.com Recipient Address: -hk_premier_support@lenovo.com Subject: Re: [External] RE: testing status - GJB26042

Error Details

Error: 550 5.7.133 RESOLVER.RST.SenderNotAuthenticatedForGroup; authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this group Message rejected by: PS1PPFCD661EAD0.apcprd03.prod.outlook.com

Notification Details

Sent by: PS1PPFCD661EAD0.apcprd03.prod.outlook.com

Original Message Headers

Received: from TYCPR01CA0133.jpnprd01.prod.outlook.com (2603:1096:400:26d::14)
 by PS1PPFCD661EAD0.apcprd03.prod.outlook.com (2603:1096:308::2e9) with
 Microsoft SMTP Server (version=TLS1_2,
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 2026 15:02:57 +0000
Received: from TY2PEPF0000AB89.apcprd03.prod.outlook.com
 (2603:1096:400:26d:cafe::8d) by TYCPR01CA0133.outlook.office365.com
 (2603:1096:400:26d::14) with Microsoft SMTP Server (version=TLS1_3,
 cipher=TLS_AES_256_GCM_SHA384) id 15.21.113.18 via Frontend Transport; Tue,
 16 Jun 2026 15:02:57 +0000
Authentication-Results: spf=pass (sender IP is 52.59.177.22)
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	for <-hk_premier_support@lenovo.com>; Tue, 16 Jun 2026 23:02:47 +0800 (CST)
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References: <000201dcfd30$fe7350e0$fb59f2a0$@3-c.com.hk> <SI2PR03MB605683611C13F7E2E31E42E4E0E52@SI2PR03MB6056.apcprd03.prod.outlook.com>
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In-Reply-To: <KUYPR03MB10046D85AE6553781408AC46282E52@KUYPR03MB10046.apcprd03.prod.outlook.com>
From: Yanchi Yu <yyc@hichain.com>
Date: Tue, 16 Jun 2026 11:02:31 -0400
X-Gmail-Original-Message-ID: <3E3DD3ABD0C9142C+CALrrhXqfydqa=-RR52z-4bhpiXuZjjgnPcdu97PUd6oL3W5sNA@mail.gmail.com>
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Message-ID: <CALrrhXqfydqa=-RR52z-4bhpiXuZjjgnPcdu97PUd6oL3W5sNA@mail.gmail.com>
Subject: Re: [External] RE: testing status - GJB26042
To: Woon Sim Lam1 <wlam1@lenovo.com>, =?UTF-8?B?5b6Q55Cz?= <lynnxu@hichain.com>
CC: Clara Sham <clarasham@3-c.com.hk>, Pui Yeng Chan <cyeng2@lenovo.com>, 
	=?UTF-8?B?5byg55Ge5Y2O?= <zhangruihua@hichain.com>, 
	Alvin Padang <palvin@lenovo.com>, CHER SHING Wong21 <cwong21@lenovo.com>, John C M LIU <ljohn3@lenovo.com>, 
	Keith Leong <lhui1@lenovo.com>, Maggie Luk <wluk@lenovo.com>, Shane Goh <egoh2@lenovo.com>, 
	Wing Wong <wingwong@3-c.com.hk>, Kar Mun Lim11 <klim11@lenovo.com>, 
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