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# Gordianus

Gordianus clears aliases from email address. Email `John.Doe+alias@gmail.com` will be transformed to `johndoe@gmail.com`.

## Why?

To detect multi-accounts on your website.

## Supported mailboxes

* [gmail.com](https://gmail.com)
* [tlen.pl](http://tlen.pl)
* [33mail.com](https://www.33mail.com)
* [outlook.com](http://outlook.com)
* [yahoo.com](http://mail.yahoo.com)

## Usage

```php
$gordianus = new \bkrukowski\Gordianus\Gordianus();
$transformedEmail = $gordianus->getPrimaryEmail('John.Doe+alias@gmail.com');
```

## Yahoo.com

Aliases work different on Yahoo than on Gmail. On Gmail part after plus is skipped.
For example message sent to `jane.doe+alias@gmail.com` will be redirected to `jane.doe@gmail.com`.

Yahoo uses the following pattern[*](https://help.yahoo.com/kb/SLN16026.html):

*baseName*-*keyword*@yahoo.com

* *baseName* - value defined by the user, different than email login;
* *keyword* - one from a list of keywords defined by the user.

Therefore we do not know what is the real email, so in this case result will be `baseName@yahoo.com`,
which actually does not exist.