SMTP, which is an acronym for Simple Mail Transfer Protocol, is the software that permits you to send out emails from your email addresses. Without this, you won't be able to use e-mail apps or webmail. After you send a message, your SMTP server creates a connection to a DNS server to find out exactly where e-mails for the recipient domain are taken care of. After that, it creates a connection to the remote email server and trades information. In case the recipient mail box is present, your server transmits the email to the receiving POP/IMAP server and the latter delivers that email to the precise mailbox in which the recipient can get it. If you wish to send e-mails, it is recommended to make sure that the website hosting company offers the service with their packages. Even if you work with an online form that website visitors use to contact you, you will still require an active SMTP server for your hosting account for the web form to operate.