v5.5 [Feb 26, 2015]
1. Fixed IMAP bug for some special mail.
2. Improve mail server performance.
3. Improve webmail performance.
4. Upgrade PHP to 5.4.35.
5. Upgrade Sqlite to 3.8.7.2.
v5.0 [Jul 10, 2012]
-Added password-guessing detection function.
-Rewrite DNS cache function to improve the domain query performance.
-Webmail added multi-tab in default template.
-Webmail added one new style template for iPad and Android touch pad.
-The new webmail style template support iPhone.
-Webmail support IE10.
-Improve webmail show speed.
-Support Windows 8.
-Support Wap for mobile.
-The personal address support add multi telephone number.
-Default disable SSLv2 and weak encryption ciphers for https service.
