Spam email is unsolicited and unwanted junk email sent out in bulk to an indiscriminate recipient list.
Typically, spam is sent in massive volume by botnets, networks of infected computers.
Spam email can be difficult to stop, as it can be sent from botnets. As a result, the original spammer can be difficult to trace and stop.
However spam emails could be improvised by creating necessary filtering rule from Smartermail end.
By creating the content filtering rule with the administrator account, it will affect the setting for the entire domain users.
If your email account is not domain administrator account, you can still create the content filtering rule for your email account under "My Settings".
You may refer to this link to login as Administrator:
SmarterMail includes a variety of antispam measures that will help keep a user's inbox free of unwanted mail.
In the Spam Filtering section, users can review/configure the spam filtering options and trusted senders for their account.
Greylisting is a new tool in the fight against spam. What it does is temporarily block incoming mail from
a sender. It returns the mail to the sender's mail server with a message saying try again later. The sending
server must then retry sending the mail after the Block Period but before the Pass Period.