SMTP, which is short for Simple Mail Transfer Protocol, is the software that permits you to send out emails from your email addresses. Without it, you will not be able to use email applications or webmail. After you send a message, your SMTP server creates a connection to a DNS server to determine where the e-mails for the recipient domain name are taken care of. Following that, it creates a connection to the remote email server and exchanges information. If the recipient mail box is present, your server sends the e-mail to the receiving POP/IMAP server and the latter brings that email to the specific mailbox in which the recipient can see it. If you want to send emails, it is best to make sure that the web hosting company offers the service with their plans. Even if you use an online form that website visitors use to contact you, you will still need an active SMTP server for your hosting account for the form to function.
