Not sure I'm understanding your question correctly but Display channels are used to create custom presentation of your content depending on what device etc you are using. So you can set up a display channel to render content to mobile phones, rss, mail template etc. So that's one way...
Visitor groups is another. This one is mainly used to render different content to different target groups but might be fitting in some cases when sending mails as well (since it's probably a different target group as well).
...or you can ask a developer to "make it happen" with some custom code and maybe a few extra properties for the editor.
Does EPI support workflow management capability? e.g. to change the tone of the content presentend on the website to the tone of content required in the communications (e.g. e-mail)
Thank you in advance.