Pardon me if I am missing some information or something obvious. This is my first post. Has anyone been able to successfully run iMIP on calendarserver 2.4.dfsg-7 on ubuntu 12.04? I have been playing around for hours with various configurations without success. I have followed the instructions provided here. I have a created a separate IMAP account on the mail server and this mail server is on the same host as the calendarserver. I have set my caldavd.plist as follows: iMIP Enabled MailGatewayServer localhost MailGatewayPort 62310 Username calendar Password mycalendaruserpassword Sending Server mymailserver.fqdn Port 587 UseSSL Username calendar Password mySMTPuserpassword Address calendar@mydomain.fqdn Receiving Server mymailserver.fqdn Port 143 Type imap UseSSL Username calendar Password myIMAPuserpassword PollingSeconds 30 AddressPatterns mailto:.* The error logs in debug mode indicate nothing as does the mail.log. # grep imip /var/log/caldavd/error.log # The only messages I see are: 2014-03-18 04:56:26+0100 [-] [caldav-8443] [PooledMemCacheProtocol,client] [twistedcaldav.scheduling.scheduler#error] Unknown calendar user address: mailto:myemail@mydomain.fqdn 2014-03-18 04:56:26+0100 [-] [caldav-8443] [PooledMemCacheProtocol,client] [twistedcaldav.scheduling.scheduler#info] METHOD: REQUEST, Component: VEVENT 2014-03-18 04:56:26+0100 [-] [caldav-8443] [PooledMemCacheProtocol,client] [twistedcaldav.scheduling.scheduler.ScheduleResponseQueue#error] Error during PUT for mailto:myemail@mydomain.fqdn: None I was expecting some twistedcaldav.scheduling.imip messages in the log to indicate that the service/gateway had been enabled. If anyone has a working configuration, would you mind sharing your configuration?