2013.12.07
*fix a bug on SMTP received time stamp for time zone.
修正一个问题，SMTP Received: 时间戳时区不正确的问题.
*auto remove incorrect blank line in header on SMTP.
自动检测去掉SMTP传送过程中的异常空行(缺省关闭状态)：[System] SmtpAntiBlank=?
2013.11.05
*fix a member lost bug when modify group password.
改正邮件组修改密码会丢失成员的Bug.
*limit MX up to three IPs when send directly.
限制直接发送邮件时一个MX最多只取3个IP，避免过度尝试发送.
