If you wish to send email messages through an e-mail address with your domain, you have to make sure that the provider will provide you with usage of their SMTP server. The aforementioned is the software system which allows e-mail messages to be sent out. SMTP is an acronym for Simple Mail Transfer Protocol and it deals with all outgoing e-mails from apps, webmail and contact web forms. Whenever a message is sent, the SMTP server checks with all the DNS servers worldwide where the emails for the receiving domain are managed and when it gets this data, it connects into the remote POP/IMAP server to check if the recipient mailbox is available. When it does, the SMTP server sends the e-mail body and so the receiving server sends it to the mail box where the recipient can open it and read it. Without an SMTP server on your server, you will not be capable to send e-mails in any way.