SMTP, which is an acronym for Simple Mail Transfer Protocol, is the software that permits you to send out e-mail messages from your email addresses. Without this, you will not be able to employ email apps or webmail. Whenever you send a message, your SMTP server connects 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 is accessible, your server sends the email to the receiving POP/IMAP server and the latter brings that message to the specific mailbox in which the recipient can access it. If you would like to be able to send e-mails, it is recommended to ensure that the website hosting company offers the service with their plans. Even though you use an online form that visitors use to get hold of you, you still need an active SMTP server for your hosting account for the web form to function.