[horde] IMAP - Autodiscovery

[Pine A]

Activesync autodiscovery is working pretty fine on windows devices.

I am trying to configure outlook 2013 imap autodisocvery, all is going well
except username is not getting passed in full completely ( look like only
alias is getting passed without domain name ) to dovecot. is there any way
to fix this issue.

Here are the dovecot logs

Sep 05 20:08:38 imap-login: Info: Login: user=<test1 at xdomain.com>,
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=8958, TLS
Sep 05 20:08:38 imap-login: Info: Login: user=<test1 at xdomain.com>,
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=8957, TLS
Sep 05 20:08:38 pop3-login: Info: Aborted login (no auth attempts):
rip=1.2.3.4, lip=172.16.1.244
Sep 05 20:08:39 imap(test1 at xdomain.com): Info: Disconnected: Logged out
bytes=39/441
Sep 05 20:08:39 imap(test1 at xdomain.com): Info: Disconnected: Logged out
bytes=39/441
Sep 05 20:08:40 imap-login: Info: Disconnected (auth failed, 1 attempts):
user=<test1>, method=PLAIN, rip=1.2.3.4, lip=172.16.1.244, TLS: Disconnected
Sep 05 20:08:40 imap-login: Info: Login: user=<test1 at xdomain.com>,
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=8961, TLS
Sep 05 20:08:40 imap(test1 at xdomain.com): Info: Disconnected: Logged out
bytes=39/441
Sep 05 20:08:44 pop3-login: Info: Disconnected (auth failed, 1 attempts):
user=<test1>, method=PLAIN, rip=1.2.3.4, lip=172.16.1.244, TLS: Disconnected
Sep 05 20:08:44 imap-login: Info: Disconnected (auth failed, 1 attempts):
user=<test1>, method=PLAIN, rip=1.2.3.4, lip=172.16.1.244, TLS: Disconnected
Sep 05 20:09:53 imap-login: Info: Login: user=<test1 at xdomain.com>,
method=PLAIN, rip=1.2.3.4, lip=172.16.1.244, mpid=8964, TLS
Sep 05 20:10:06 imap-login: Info: Login: user=<test1 at xdomain.com>,
method=PLAIN, rip=1.2.3.4, lip=172.16.1.244, mpid=8967, TLS
Sep 05 20:10:06 imap(test1 at xdomain.com): Info: Disconnected: Disconnected
in IDLE bytes=11/305


Regards,

Pine A