[ 本帖最后由 tdk 于 2007-6-21 15:14 编辑 ]作者: tdk 时间: 2007-6-21 16:37
看看了看kerio的帮助
里面写道
Use SSL if supported by remote SMTP server...
When sending a message, SMTP server attempts to use encrypted connection first (SSL). If SSL connection is not supported, unencrypted connection will be used. Thus the maximal possible security of sent messages is ensured.