I got the issue, that there are 2 similar "To:" fields in my Email headers in outgoing mail. So the mails are marked as spam or are unable to deliver. Does anyone know anything about that behavior?
To: [email protected]
To: [email protected]
From: "[email protected]2"
<[email protected]2>
Subject: asdf
To: [email protected]
To: [email protected]
From: "[email protected]2"
<[email protected]2>
Subject: asdf