Symptoms

  • All or some users of your domain are receiving unwanted/ suspicious mail from ids of a foreign domain.  
  • Few users are receiving unwanted/ suspicious mail from ids of an external domain.

Solution 

  • Blacklist the sender's domain 
  • Refer to the steps mentioned in the Admin Guides to blacklist the sender's domain name. After blacklisting the domain, no users from the blacklisted domain will be able to send any mail to any user on your domain. 

Reference Topics