SMTP, which is an acronym for Simple Mail Transfer Protocol, is the software that enables you to send out messages from your email addresses. Without this, you will not be able to employ email apps or webmail. Whenever you send an email, your SMTP server creates a connection to a DNS server to discover exactly where emails for the recipient domain name are managed. Following that, it creates a connection to the remote mail server and trades information. In case the recipient mailbox is available, 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 access it. If you wish to send e-mails, you should always make sure that the website hosting company provides the service with their packages. Even though you work with an online form that site visitors use to make contact with you, you will still require an active SMTP server for your hosting account for the form to operate.