Please confirm if you support Lotus Domino Mail server too.
It should work -- I know customers use Chilkat when connecting to that type of mail server.
(The reason it should work is that protocols exist to specifically and unambiguously define the communications between a client and server. (Thus there are protocols such as SMTP, POP3, IMAP, etc.) The brand or implementation of the server should not matter -- as long as it correctly implements the protocol. For example, a new brand of mail server could come into existence, and Chilkat, Mozilla Thunderbird, and all other existing email clients should instantly work with it.)