This problem occured when I deploied Parallels Plesk Panel 11 on Amazon EC2 service. I did it and solved the problem:
mkdir /etc/postfix/tls
chown root:postfix /etc/postfix/tls
chmod u=rwx,go= /etc/postfix/tls
cd /etc/postfix/tls
openssl req -new -x509 -nodes -out smtpd.pem -keyout smtpd.pem...
This error occurred always when I try to send one email using my server and authentication STARTTLS. Here message from mailer daemon:
Signature: Postfix SMTP server: errors from unknown[187.75.4.156]
Message:
Transcript of session follows.
Out: 220 age1.com.br ESMTP Postfix
In...