Spam Hammer

Spam Hammer is a method of defending e-mail users against spam by “temporarily rejecting” any email from a sender it does not recognize. If the mail is legitimate, the originating server will, after a delay, try again and if sufficient time has elapsed, the email will be accepted. If the mail is from a spammer it will probably not be retried since a spammer goes through thousands of email addresses and typically cannot afford the time delay to retry. You can either enable Spam Hammer for a single email address or for all addresses on a domain. Spam Hammer can only be enabled for a domain if it has email accounts.
*** Although Spam Hammer will stop many SPAM emails from reaching you, there is a possibility of blocking legitimate emails from reaching your account as well. Please take this into consideration before enabling Spam Hammer.***