If these are all going to be processed by the same person, there's no need to create a new user for each of the addresses. In the Exchange Management Console, open up the properties of your info user and go to the Email Addresses tab. From there, add an SMTP address and add
email@example.com as aliases.
If for example
firstname.lastname@example.org are managed by different people, you can either add these aliases to individual users (as described above) or you can create a separate user or distribution list to handle these addresses (e.g a user called
Info at domain2.com).