"alias" is a pseudo email account, where all
email sent to the alias gets auto-forwarded to another
email address. Example:
Let's say that you have
an email account named "webmaster".
This would make your email address "email@example.com".
Next, if we create an alias and call the alias
"info", we can then point the alias to the
"webmaster" account. What this does is
auto-forward all email sent to firstname.lastname@example.org to
email@example.com 's email account. When user
"webmaster" fetches his email, he will be
retrieving email for both "firstname.lastname@example.org"
automatically. If you are given five aliases,
then you can have all five alias point to just one
account, or you can mix and match them anyway the
customer wishes. E.g. "info",
"sales", and "support" can be 3
aliases that point to "email@example.com".
Then you can have a second email account
"john" (firstname.lastname@example.org) and have 2
aliases point to it. E.g., "susy" and
"betty" can be 2 aliases that point to
"email@example.com". When someone sends
email to "firstname.lastname@example.org" or
"email@example.com", those emails will be
auto-forwarded to the account "firstname.lastname@example.org".