SMTP, which stands for Simple Mail Transfer Protocol, is the software that permits you to send e-mail messages from your email addresses. Without it, you will not be able to employ e-mail apps or webmail. After you send a message, your SMTP server creates a connection to a DNS server to learn exactly where e-mails for the recipient domain are taken care of. After that, it connects to the remote email server and trades details. If the recipient mail box exists, your server sends the message to the receiving POP/IMAP server and the latter delivers that message to the precise mailbox in which the recipient can find it. If you wish to send e-mails, it is best to ensure that the website hosting company has the service with their packages. Even though you use an online form that visitors use to get hold of you, you still require an active SMTP server for your hosting account for the web form to work.