在ASP下用JAMIL发EMAIL出这以下错误，要怎么办。(50分)

Jmail的错误提示，我应该怎么办呢。 192.168.0.10是装了2000，并有启动SMTP
The message was undeliverable. All servers failed to receive the message ClientLogging enabled: Client Remote Address: 192.168.0.14 .execute() { Trying server mail:192.168.0.10 <- 220 abby Microsoft ESMTP MAIL Service, Version: 5.0.2195.5329 ready at Fri, 13 Jun 2003 17:25:32 +0800 -> EHLO abby <- 250-abby Hello [192.168.0.10] 250-AUTH GSSAPI NTLM LOGIN 250-AUTH=LOGIN 250-TURN 250-ATRN 250-SIZE 2097152 250-ETRN 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-8bitmime 250-BINARYMIME 250-CHUNKING 250-VRFY 250 OK -> MAIL FROM: <- 250 2.1.0 callrong@21cn.com....Sender OK -> RCPT TO:abby@buildbook.com.cn <- 550 5.7.1 Unable to relay for abby@buildbook.com.cn -> DATA <- 554 5.5.2 No valid recipients Error: 554 5.5.2 No valid recipients ClientLogging enabled: Client Remote Address: 192.168.0.14 .execute() { Trying server mail:192.168.0.10 <- 220 abby Microsoft ESMTP MAIL Service, Version: 5.0.2195.5329 ready at Fri, 13 Jun 2003 17:25:32 +0800 -> EHLO abby <- 250-abby Hello [192.168.0.10] 250-AUTH GSSAPI NTLM LOGIN 250-AUTH=LOGIN 250-TURN 250-ATRN 250-SIZE 2097152 250-ETRN 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-8bitmime 250-BINARYMIME 250-CHUNKING 250-VRFY 250 OK -> MAIL FROM: <- 250 2.1.0 callrong@21cn.com....Sender OK -> RCPT TO:abby@buildbook.com.cn <- 550 5.7.1 Unable to relay for abby@buildbook.com.cn -> DATA <- 554 5.5.2 No valid recipients Error: 554 5.5.2 No valid recipients 1 of 1 servers failed } 2003-6-13 17:25:32The message was undeliverable. All servers failed to receive the messagetrue

好像是没有设置relay的关系，如果没有设置relay不同网段的邮件不能互相传递的。