Inbound Mail fails to connect to the Lotus Domino server with message 'failed to connect for server named (server name) with user name (username)'. The Server name and login details are correct.
Need to make sure that Mail Server and mail account are imap4 enabled and port 143 is open.
Check the following link for instructions on how to set up the IMAP service on a Domino server:
ITBM 7.x Lotus Domino Server