SMTP, which stands 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 where the emails for the recipient domain name are managed. Following that, it creates a connection to the remote mail server and trades information. If the recipient mailbox exists, your server transmits the message to the receiving POP/IMAP server and the latter brings that e-mail to the precise mailbox where the recipient can access it. If you would like to send e-mails, it is best to ensure that the hosting company offers the service with their packages. Even though you make use of online form that visitors use to get hold of you, you'll still need an active SMTP server for your hosting account for the web form to operate.