Spam blocking for email accounts

Anyone know how to block spam ads from email accounts?  I have both work and personal email accounts--spam only coming in on on personal.  I've installed Lookout Mobile Security, but doesn't stop the 7-10 product ads per day from coming into my inbox.  Verizon tech assistance was courteous and helpful, but wrong.  They're the ones who told me to install Lookout Mobile Security. It may work for antivirus, but doesn't stop spam.