What type of hardware are you using: VPS bought online
What YunoHost version are you running: 12.1.28
Are you in a special context or did you perform specific tweaking on your YunoHost instance ?: no
Describe your issue
My wife has to use a mailing list for our kid’s school class.
She sends her mail (from our yunohost server via familie@myserver.com) to the external mailing list address and this mail gets delivered to all members of this mailing list (with my wife’s mail address as sender and reply-to).
Problem:
Our yunohost mail server rejects the incoming mail from the mailing list (with the identity of my wife’s email).
According to the postmaster of the mailing list, it is the fault of my yunohost server, because the DKIM header of the email should be accepted by our server.
I have the mail DSN settings configured as recommended by Yunohost and did not find any errors.
Does anybody have more experience with DKIM and yunohost?
Thank you in advance 
Share relevant logs or error messages
Diagnosis info for admins
ATTENTION: Domain names and IP changed for privacy reasons
Generating Server: et01.maillist-server.net
familie@myserver.com
myserver.com
Remote Server returned ‘553 5.7.1 familie@myserver.com: Sender address rejected: not logged in’
Original header:
Received: from ex01.maillist-server.net (172.20.0.45) by mx01.maillist-server.net (172.20.0.47)
with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Mon, 13 Oct
2025 09:03:00 +0200
Received: from ex02.maillist-server.net (2001:920:19e7:be0::46) by ex01.maillist-server.net
(2001:920:19e7:be0::45) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Mon, 13 Oct
2025 09:03:00 +0200
Received: from et01.maillist-server.net (172.20.0.47) by ex02.maillist-server.net (172.20.0.46)
with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17 via Frontend
Transport; Mon, 13 Oct 2025 09:03:00 +0200
Received: from myserver.com (33.333.333.333) by mx01.maillist-server.net (172.20.0.47)
with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Mon, 13 Oct
2025 09:02:59 +0200
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=myserver.com; s=mail;
t=1760338977; bh=csdxKWk77zi0Jlx7EYCv/26gyU0RcuvkxsvK+ICg3pU=;
h=Date:Subject:References:To:From:In-Reply-To:From;
b=TC+bBOhaSIZ4cliyVhcqQTD3YMMxwXa2IpgqijZz5SEWW9xnVwk2omHGsHnJD4YGh
JHvgPiEJ5HBI1w78kDGRCHNC59lZp/+dGsRUKQENH2Bm+QU3q9wNtCPanNcpf4D2KF
Lt+dsZnXAeeVcn4yj7OGZO8cMLZUeustrLY7gTfo=
Message-ID: 27831e4c-d716-4ce2-a1cc-ee800b3dbfb3@myserver.com
Date: Mon, 13 Oct 2025 09:02:57 +0200
MIME-Version: 1.0
Subject: Some subject ?
Content-Language: de-AT-frami
References: b910242a-9156-478b-a126-a90c3b09b65d@myserver.com
To: eltern5b eltern5b@maillist-servergymnasium.de
From: Familie Caliandro familie@myserver.com
In-Reply-To: b910242a-9156-478b-a126-a90c3b09b65d@myserver.com
X-Forwarded-Message-Id: b910242a-9156-478b-a126-a90c3b09b65d@myserver.com
Content-Type: text/plain; charset=“UTF-8”; format=flowed
Content-Transfer-Encoding: 8bit
Return-Path: familie@myserver.com
Received-SPF: Pass (et01.maillist-server.net: domain of familie@myserver.com designates
33.333.333.333 as permitted sender) receiver=et01.maillist-server.net;
client-ip=33.333.333.333; helo=myserver.com;
X-Auto-Response-Suppress: DR, OOF, AutoReply
Reporting-MTA: dns;et01.maillist-server.net
Received-From-MTA: dns;ex01.maillist-server.net
Arrival-Date: Mon, 13 Oct 2025 07:03:00 +0000
Final-Recipient: rfc822;familie@myserver.com
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;553 5.7.1 familie@myserver.com: Sender address rejected: not logged in
Remote-MTA: dns;myserver.comy
