SMTP, which stands for Simple Mail Transfer Protocol, is the software that permits you to send out e-mails from your email addresses. Without it, you won't be able to employ e-mail apps or webmail. After you send a message, your SMTP server connects to a DNS server to learn exactly where emails for the recipient domain are handled. After that, it creates a connection to the remote email server and trades details. In case the recipient mail box is accessible, your server sends the message to the receiving POP/IMAP server and the latter brings that message to the precise mailbox where the receiver can see it. If you want to be able to send emails, it is recommended to ensure that the website hosting company offers the service with their plans. Even though you use an online form that website visitors use to get hold of you, you'll still require an active SMTP server for your hosting account for the web form to function.