[horde] Help for Activesync

[murali at itechservices.in]

Hi
    I have setup postfix dovecot mailserver and installed horde groupware 
webmail 5.2.9 following this link 
https://www.howtoforge.com/install-horde-5-webmail-for-ispconfig-on-debian-wheezy 
(i am not using ispconfig) on debian jessie I am unable to configure 
active sync account from samsung tab and gives error (you entered an 
incorrect server address or the server requires a protocol version that 
Email does not support) but other server which runs  debian wheezy with 
horde 5.2.8 is able to sync with my samsung tab. Please help to resolve 
this issue.

Thanks in advance.