Open Relay Mail Server

What does that mean - As a short definition, open relay mail servers are mail servers that accept mails without any restriction made to the message sender and recipient for relaying. A non-technical definition is basically anyone can authenticate and then use your email server to send mail. )An email server should only allow those within your organization to send email.)

Open relays are widely used by spammers to send their spam over the whole Internet and it is nearly impossible to track down the person who is actually sending the email. What normally happens is that the person getting spammed will then report your domain name to any number of Black Lists and if a company is using a spammer filter, your email will not get through.