SMTP, which stands for Simple Mail Transfer Protocol, is the software that permits you to send out messages from your email addresses. Without it, you will not be able to employ e-mail applications or webmail. After you send an e-mail, your SMTP server creates a connection to a DNS server to learn exactly where e-mails for the recipient domain name are managed. After that, it creates a connection to the remote email server and exchanges details. In case the recipient mail box is accessible, your server transmits the e-mail to the receiving POP/IMAP server and the latter delivers that message to the precise mailbox where the receiver can find it. If you would like to be able to send emails, you should always make sure that the website hosting company has the service with their plans. Even when you make use of online form that visitors use to make contact with you, you'll still need an active SMTP server for your hosting account for the form to operate.