The most amazing thing about email marketing is that everyone is unique is some way.
The most obvious of these differences is the type of information each client wishes to keep about their recipients. For some it's just First Name, for others it's a hundred different fields including text fields, dates for recurring campaigns, check boxes for subscriptions, drop down lists, radio buttons and so on.
There's no limit to the number of fields you can have, no restrictions on field names (so you can easily match with your CRM), no limitation on the type of field and of course you can set validations. In short, it doesn't matter what you information you want to maintain, you can.
You can delete fields too, but just to be safe we won't let you accidentally delete a field that you're currently using in a web form (like a "subscribe here")
