STEPS TO BLACKLIST AN EMAIL ACCOUNT:

How to report SPAM
When you receive a SPAM message you have a choice to either just delete it and move on, or Report it to our mail server to improve its antispam performance.

To report the spam message select the message in your inbox, right-click and select “Forward as attachment.” or simply “Forward” if your email software doesn’t support “Forward as attachment” .

Address it to assp-spam@xxx.com and click SEND. Done , you have reported the spam message.

Suppose your domain name is xxx.com,

1.  please send a mail to assp-spam@xxx.com and follow the below steps

2.  body of the mail should contain the email id which is to be blacklisted

3. subject should be “add to blacklist/spam”

4.  In a short time you will receive a spam confirmation.

Also please be sure that “My outgoing server (SMTP) requires authentification” is checked on your email client (smtp advanced settings) .