Making an e-mail alias means setting up an email address that shares the very same mailbox with a totally different address both for the incoming as well as the outbound email messages. For example, you are able to create an e-mail address email@example.com and it'll be associated with its very own mailbox. After that, you can make an alias firstname.lastname@example.org, which can use the mailbox of sales@ and won't have a mailbox of its own. Once you look at your e-mails, you will notice email messages sent to either one of the two email addresses in one location, which might be far more convenient in some circumstances since you will not need to sign in and out of various email addresses working with webmail or create multiple email addresses in an email app. This option is usually used as a replacement for forwarding e-mail messages from a single e-mail address to a new one if a number of addresses are listed for contact on a website.