Making an e-mail alias means setting up an email address which shares the same mailbox as a different e-mail address both for the inbound and the outgoing emails. For example, you are able to make an address sales@domain.com and it'll be linked to its own mailbox. Next, you can make an alias support@domain.com, which will make use of the mailbox of sales@ and does not have a mailbox of its own. If you look at your email messages, you will notice emails sent to both of the two addresses in one place, which may be far more convenient in some cases since you will not need to sign in and out of various mailboxes working with webmail or set up various email addresses in an email application. This option is frequently used as a substitute for forwarding emails from a single address to another if multiple addresses are listed for contact on a website.