SMTP, which is an acronym for Simple Mail Transfer Protocol, is the software that allows you to send messages from your email addresses. Without this, you won't be able to employ email applications or webmail. When you send an e-mail, your SMTP server creates a connection to a DNS server to discover where the emails for the recipient domain are handled. Subsequently, it connects to the remote email server and exchanges details. If the recipient mailbox exists, your server transmits the message to the receiving POP/IMAP server and the latter brings that email to the specific mailbox where the recipient can find it. If you would like to send emails, it is recommended to make certain that the web hosting company offers the service with their plans. Even though you work with an online form that visitors use to make contact with you, you still require an active SMTP server for your hosting account for the web form to operate.