If you would like to send e-mails using an email address with your own domain name, make sure that the company will give you usage of their SMTP server. The aforementioned is the software system allowing e-mails to be sent out. SMTP is an acronym for Simple Mail Transfer Protocol and it manages all outbound e-mails from apps, webmail and contact web forms. Whenever a message is sent out, the SMTP server checks with all the DNS servers worldwide where the e-mails for the receiving domain are managed and as soon as it obtains this info, it creates a connection into the remote POP/IMAP server to check if the recipient mailbox is available. When it does, the SMTP server sends the email body and the receiving server delivers it to the mailbox in which the recipient can open it and read it. Without an SMTP server on your end, you won't be able to send out e-mails in any way.