I'm trying to migrate my users' mailboxes from my old IMAP Server (CommuniGate Pro on a Mac) to Xeams on QNAP. When I run the Import Wizard with Use SSL ON and port 993, I get a certificate error. This server has a self-signed certificate. So I tried importing via port 143 (unencrypted) with Use SSL OFF and I get the error message Unable to connect to server. STARTTLS failure. This makes no sense to me, since with SSL turned off there should be no STARTTLS negotiation. If I check Use SSL with port 143 I get the error Unrecognized SSL Message. Plaintext connection?