Process should have an associated type instead of type parameter

[andrewjstone]

A process can only handle one type of message. It isn't generic over many messages.

This will change the API a bit, but shouldn't be too bad.

[crearo]

Email message should store :

1. To
2. CC

Also check the zimbra api to see if there is anything else that needs to be saved.

[Iakobs]

Hi @CreaRo! my colleague and I are working on this!

[Iakobs]

@CreaRo would you mind to tag the issue with the hacktoberfest tag, please?

[crearo]

@Iakobs any updates here?

[Iakobs]

Hey, @CreaRo! so sorry! we couldn't manage to install the app and we abandoned the pull Request. So sorry I forgot to tell you.