This is called "collateral spam" and is mostly used these days by
spammers. This is normal. There is nothing you can do to stop someone
from using your email address. Anyone on the internet can use another
person's email address to send email/spam. All it takes is to fake the
email address in the email software.
What matters is the source
IP address of the junk mail, which you can check by looking at the
headers of the original email, which should be part of the body of the
email that was returned to you.
If you wish you can contact the
source network at which the email was generated to report abuse, which
is unlikely to result in any resolution usually.
receiving such emails what you need to do is setup proper email
accounts from the control panel and disable the catch-all default
address so that invalid emails from bounces and virus/worms do not end
up in your mailbox.
If you need to get this verified that this
was indeed not your account being abused but someone else, please open a
support ticket by copy/pasting the headers of the original email as
well as the headers of the bounced message and the technical support
team can advise you.
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