I wanted to follow up with our solution to this after working within our Account Based Management module with our Marketo Business Consultant (Allison Crooks) I ended up importing a list of Named Accounts, and assigned 1 domain to each of them (I picked the one that appeared to be the main, most commonly used one). To capture the additional domain variations, we set up a Smart Campaign. Within the Smart List, we have a "Person is Created" trigger, along with an "E-mail Address" filter. For that filter, we list all of the domain variations the e-mail address could contain. For the Flow, we have "Add to Named Account", and once again list all of the domain variations the e-mail address could contain, and then selected the Named Account from the drop-down menu (make sure to have your named accounts created first so they show up as a choice). That is just for one organization. We did this for all of our Named Accounts by adding all of the domains to the Smart List, and adding multiple choices for named Accounts in the Flow. It was very easy to do (once Allison showed me), and works beautifully when importing large contact lists containing contacts of different organizations and variable domains.
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