Hi,
I already have a license for Mail.dll (1 developer - +1 Yr Support) which is being used to fetch emails from an address. Now when I try to fetch emails from some other email address it's saying "Please purchase the license"? Could you please clarify the License Terms & Conditions !!!
License conditions are pretty clear: Mail.dll email library is licensed on per-developer basis.
There are no limitations on how many servers you can connect nor number of mailboxes you can access.
Most likely you haven't put the license file in correct place.
Please follow the steps described on the after purchase page: https://www.limilabs.com/mail/afterpurchase