SMTP, which is short for Simple Mail Transfer Protocol, is the software that permits you to send emails from your email addresses. Without this, you won't be able to employ e-mail applications or webmail. After you send a message, your SMTP server creates a connection to a DNS server to learn exactly where emails for the recipient domain name are taken care of. Following that, it creates a connection to the remote email server and trades information. If the recipient mail box exists, your server sends the message to the receiving POP/IMAP server and the latter brings that email to the specific mailbox where the recipient can see it. If you'd like to send e-mails, it is best to make certain that the hosting company provides the service with their plans. Even though you work with an online form that site visitors use to make contact with you, you still require an active SMTP server for your hosting account for the web form to function.