An smtp email server is the main pathway for all your outgoing electronic messages.  This is the main server which is responsible for sending your emails from your end of the line to the recipient’s inbox.  In the headquarters of every internet service provider in the world, there is a dedicated computer which serves the purpose of being your email server.  This simply makes it easy for your ISP to recognize that you’re actually sending a message over the World Wide Web.  When you’re trying to get in touch with an employer or a loved one from afar, it is your outgoing email server that does the job for you.