SMTP, which is short for Simple Mail Transfer Protocol, is the software that permits you to send messages from your email addresses. Without this, you will not be able to use email apps or webmail. Once you send an e-mail, your SMTP server connects to a DNS server to determine exactly where e-mails for the recipient domain name are taken care of. Following that, it creates a connection to the remote mail server and trades details. If the recipient mail box is available, your server sends the message to the receiving POP/IMAP server and the latter brings that email to the precise mailbox in which the receiver can find it. If you wish to send emails, it is recommended to make certain that the website hosting company has the service with their plans. Even when you work with an online form that visitors use to get hold of you, you will still need an active SMTP server for your hosting account for the form to function.