E-mail is a time-tested protocol that needs no introduction. A personal mail server will provide special privacy for all correspondence and is useful for registering in online services and personal correspondence, especially for [Delta.Chat]({{< ref "delta-chat.md" >}}).
Use aliases for questionable services or one-time needs.
Messages for `user+alias@domain.com` will go to `user@domain.com`. It can be useful for spam origin analysis if a unique alias is used for each online service when registering.
For example, `bank+user@domain.com`, `cryptoexchenge+user@domain.com`, and so on.
#### Directory Filter
Create directories of filters for different purposes. This will help protect against phishing and clogging your inbox.
The message for `user-dir@domain.com` will create a `dir` directory in the `user@domain.com` mailbox and all mail will arrive in the `dir` directory.
Examples:
-`user-w@domain.com` - for registering with web services