We have got a Active Directory domain with a sinle exchange server.Whne we try to send an email to a client it remains in the smtp queque with the clients domain name.Ive ranSMTP diadand the outtput is the fopllowing:Searching for Exchange external DNS settings. Computer name is SRV-EMAIL. VSI 1 has the following external DNS servers: There are no external DNS servers configured. Checking SOA for transurban.com. Checking external DNS servers. Checking internal DNS servers. SOA serial number match: Passed. Checking local domain records. Checking MX records using TCP: kapsch.com.ar. Checking MX records using UDP: kapsch.com.ar. Both TCP and UDP queries succeeded. Local DNS test passed. Checking remote domain records. Checking MX records using TCP: transurban.com. Checking MX records using UDP: transurban.com. Both TCP and UDP queries succeeded. Remote DNS test passed. Checking MX servers listed for JNassau@transurban.com. Connecting to transurban.com.inbound10.symantecmail.net [208.65.144.22] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound10.symantecmail.net. Connecting to transurban.com.inbound10.symantecmail.net [208.65.145.23] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound10.symantecmail.net. Connecting to transurban.com.inbound10.symantecmail.net [208.65.145.22] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound10.symantecmail.net. Connecting to transurban.com.inbound10.symantecmail.com [208.65.144.23] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound10.symantecmail.com. Connecting to transurban.com.inbound10.symantecmail.com [208.65.144.22] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound10.symantecmail.com. Connecting to transurban.com.inbound10.symantecmail.com [208.65.145.23] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound10.symantecmail.com. Connecting to transurban.com.inbound10.symantecmail.net [208.65.144.23] on port 25. Connecting to the server failed. Error: 10060 Failed to submit mail to transurban.com.inbound10.symantecmail.net. Connecting to transurban.com.inbound10.symantecmail.com [208.65.145.22] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound10.symantecmail.com. Connecting to transurban.com.inbound20.symantecmail.net [208.65.144.21] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound20.symantecmail.net. Connecting to transurban.com.inbound20.symantecmail.com [208.65.145.21] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound20.symantecmail.com. Connecting to transurban.com.inbound20.symantecmail.net [208.65.145.21] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound20.symantecmail.net. Connecting to transurban.com.inbound20.symantecmail.com [208.65.144.21] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound20.symantecmail.com. Connecting to transurban.com.inbound30.symantecmail.net [208.65.144.21] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound30.symantecmail.net. Connecting to transurban.com.inbound30.symantecmail.com [208.65.145.21] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound30.symantecmail.com. Connecting to transurban.com.inbound30.symantecmail.net [208.65.145.21] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound30.symantecmail.net. Connecting to transurban.com.inbound30.symantecmail.com [208.65.144.21] on port 25. Connecting to the server failed. Error: 10061 Failed to submit mail to transurban.com.inbound30.symantecmail.comConnection to any other smtp works fine. Do you have anycomment o suggestion whichcould help us?Many thanksRegards

You will have to ask owner of transurban.com.inbound30.symantecmail.net to whitelist your sending ip or your domain. also you can find MX record of their domain and do telnet from your server and try to submit message if still that donot goes this means they are not accepting your ip. http://www.msexchange.org/articles/MS_Exchange_SMTP_POP3_and_Telnet.html also it would not be a bad idea to check if your domain/ip is blacklisted somewhere. many people donot accept mail if they find senders ip is blacklisted. http://www.mxtoolbox.com/blacklists.aspx Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

Thnaks Vinod,We cant telnet the ip which maches their mx record.Do you think they are blocking our smtps IP?

Yes that means they are not allowing you to connect to their Servers Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|