我用MDadmon 9.04版本,给个别发送总是失败,以下是日志,请高手分析以下,谢谢！

changeme

Sun 2008-01-13 09:52:23: To: wxiong@ptc.com
Sun 2008-01-13 09:52:23: Subject: =?gb2312?B?08q8/rLiytQ=?=
Sun 2008-01-13 09:52:23: Message-ID: <200801130952110781561@bplead.com>
Sun 2008-01-13 09:52:23: 正在进行[ptc.com]的 MX-记录解析（DNS 服务器：202.106.0.20）...
Sun 2008-01-13 09:52:23: *  P=030 S=002 D=ptc.com TTL=(34) MX=[irp1.ptc.com]
Sun 2008-01-13 09:52:23: *  P=040 S=000 D=ptc.com TTL=(34) MX=[irp4.ptc.com]
Sun 2008-01-13 09:52:23: *  P=060 S=001 D=ptc.com TTL=(34) MX=[relay4.ptc.com]
Sun 2008-01-13 09:52:23: Attempting MX: P=030 S=002 D=ptc.com TTL=(34) MX=[irp1.ptc.com]
Sun 2008-01-13 09:52:23: 试图 SMTP 连接到 [irp1.ptc.com : 25]
Sun 2008-01-13 09:52:23: [irp1.ptc.com] 的 A 记录解析正在进行（DNS 服务器：202.106.0.20）...
Sun 2008-01-13 09:52:23: D=irp1.ptc.com TTL=(240) A=[12.11.148.83]
Sun 2008-01-13 09:52:23: 试图 SMTP 连接到 [12.11.148.83 : 25]
Sun 2008-01-13 09:52:23: 等候连接...
Sun 2008-01-13 09:52:23: 已建立连接 (192.168.1.5 : 3319 -> 12.11.148.83 : 25)
Sun 2008-01-13 09:52:23: 等待协议初始化...
Sun 2008-01-13 09:52:24: <-- 554 irp1.ptc.com
Sun 2008-01-13 09:52:24: --> QUIT
Sun 2008-01-13 09:52:24: Attempting MX: P=040 S=000 D=ptc.com TTL=(34) MX=[irp4.ptc.com]
Sun 2008-01-13 09:52:24: 试图 SMTP 连接到 [irp4.ptc.com : 25]
Sun 2008-01-13 09:52:24: [irp4.ptc.com] 的 A 记录解析正在进行（DNS 服务器：202.106.0.20）...
Sun 2008-01-13 09:52:24: D=irp4.ptc.com TTL=(240) A=[12.11.148.86]
Sun 2008-01-13 09:52:24: 试图 SMTP 连接到 [12.11.148.86 : 25]
Sun 2008-01-13 09:52:24: 等候连接...
Sun 2008-01-13 09:52:24: 已建立连接 (192.168.1.5 : 3320 -> 12.11.148.86 : 25)
Sun 2008-01-13 09:52:24: 等待协议初始化...
Sun 2008-01-13 09:52:25: <-- 554 irp4.ptc.com
Sun 2008-01-13 09:52:25: --> QUIT
Sun 2008-01-13 09:52:25: Attempting MX: P=060 S=001 D=ptc.com TTL=(34) MX=[relay4.ptc.com]
Sun 2008-01-13 09:52:25: 试图 SMTP 连接到 [relay4.ptc.com : 25]
Sun 2008-01-13 09:52:25: [relay4.ptc.com] 的 A 记录解析正在进行（DNS 服务器：202.106.0.20）...
Sun 2008-01-13 09:52:25: D=relay4.ptc.com TTL=(240) A=[12.11.148.124]
Sun 2008-01-13 09:52:25: 试图 SMTP 连接到 [12.11.148.124 : 25]
Sun 2008-01-13 09:52:25: 等候连接...
Sun 2008-01-13 09:52:26: 已建立连接 (192.168.1.5 : 3321 -> 12.11.148.124 : 25)
Sun 2008-01-13 09:52:26: 等待协议初始化...
Sun 2008-01-13 09:52:26: <-- 554 relay4.ptc.com
Sun 2008-01-13 09:52:26: Socket connection closed by the other side (how rude!)
Sun 2008-01-13 09:52:26: SMTP 会话终止（in/out 字节： 56/12）
Sun 2008-01-13 09:52:26: ----------

FlyingDuan

最后Sun 2008-01-13 09:52:26: Socket connection closed by the other side (how rude!)
应该是对方的原因