[Resolved] Postfix X-Authentication Warning

It’s possible to see X-Authentication-Warning in the email header when the mail server doesn’t trust the user. This can sometimes cause emails to be marked as spam. To solve the problem, you can add the user to the /etc/mail/trusted-users file. If your system includes forms that are used to send email as the Apache user, you need to add the “Apache” user to the trusted-users file.