Multiple Email Aliases
Another approach is to register one main and many auxiliary email addresses which will forward all mail to the main address i.e. being used as aliases to the main address. The advantage of this approach is that the user can easily detect which auxiliary email is 'leaking' with spam and block or dispose it. It requires additional time to set up forwarding. However, this method allows storage and access of all emails from a single main account, although to manage forwarding the user has to remember the password for each alias.
A variation on this is to use a catch-all address then forward to the real mailbox using wildcards. A lot of mail servers allow the use of '*' meaning 'any number of characters'. This makes the whitelist automatic and only requires the administrator to update the blacklist occasionally. In effect the user has one address but it contains wild cards e.g.; 'me.*@my.domain' which will match any incoming address that starts with 'me.' and ends with '@my.domain'. This is very similar to the '+' notation but may be even less obvious since the address appears completely normal.
Read more about this topic: Disposable Email Address
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