I think you men just put in the email address and the application will set itself up. Microsoft Mail and Mozilla Thunderbird (https://www.mozilla.org/en-US/thunderbird/) will do that for you for the most part. Gmail will let you link up to 5 external email accounts. (https://www.makeuseof.com/tag/import-manage-multiple-email-a...) You still may have to do some configuration but they're the easiest I know of.

Hope that helps.