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A common technique for spammers to use is what is known as a dictionary attack on a domain. A dictionary attack, in our context, is a single SMTP connection that attempts to send email from a spam source to a random set of names on our domain, e.g. bob@ourdomain.com fred@ourdomain.com harry@ourdomain.com, in the hope that one of the many hundreds that we try will get a hit and deliver our spam.
This technique is used by spammers mainly because most people don't advertise their email addresses (due to spam!) and they want to access this untapped market.
To prevent this type of spam getting through, it is essential that you do not use the Default Address (catchall) feature within cPanel to receive emails wherever possible. You should always setup specific Forwarders (aliases) for any email addresses you use and set the Default Address to :fail: for each domain.
FIX- Log into your Cpanel account and go to default addresses. set your accounts to do as the following example shows:
WHERE:
HOW:
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