hMailServer 无法发送外部邮件

JeffreyXu

       本人注册了顶级域名，在家中搭建了hMailServer。目前的情况是：自身域名内收发邮件没有问题；其它邮件发的邮件能收到；
但是向其它邮箱发送邮件始终不成功（比如：yeah.net）。查了日志如下：
"APPLICATION" 4844 "2013-03-23 16:04:41.562" "SMTPDeliverer - Message 5: Delivering message from server@xxxxxx.com to yyyyyy@yeah.net. File: C:\Program Files\hMailServer\Data\{091BF507-B3A7-40E0-9B7B-FB9EC8030D47}.eml"
"TCPIP" 4844 "2013-03-23 16:04:41.562" "DNS - MX Lookup: yeah.net"
"TCPIP" 4844 "2013-03-23 16:04:41.562" "DNS - MX Result: 6 IP addresses were found."
"TCPIP" 4844 "2013-03-23 16:04:41.562" "Connecting to 123.58.178.224..."
"APPLICATION" 328 "2013-03-23 16:05:02.593" "SMTPDeliverer - Message 5 - Connection failed: Host name: 123.58.178.224, message: 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。"
"TCPIP" 4844 "2013-03-23 16:05:02.593" "Connecting to 123.58.178.225..."
"APPLICATION" 328 "2013-03-23 16:05:23.625" "SMTPDeliverer - Message 5 - Connection failed: Host name: 123.58.178.225, message: 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。"
"TCPIP" 4844 "2013-03-23 16:05:23.625" "Connecting to 123.58.178.226..."
"APPLICATION" 328 "2013-03-23 16:05:44.640" "SMTPDeliverer - Message 5 - Connection failed: Host name: 123.58.178.226, message: 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。"
"APPLICATION" 4844 "2013-03-23 16:05:44.640" "SMTPDeliverer - Message 5: Message could not be delivered. Scheduling it for later delivery."
"APPLICATION" 4844 "2013-03-23 16:05:44.640" "SMTPDeliverer - Message 5: Message delivery thread completed."


哪位高人能帮忙指点迷津，谢谢~