>According to http://msdn.microsoft.com/library/default.asp?url=/library/en-us/e2k3/e2k3/_cdoex_error_codes_for_exchange_2000_server.asp the error 0x80040217L means that the transport was unable to log on to the server. Does your SMTP server require authentication? You can find the list of all configuration items, including user name and password at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/_cdosys_schema_configuration.asp

That's right.. And, following this path.. I found this option that works fine:

With iMsg
     .Fields("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate") = 1
     .Configuration        = iConf
..

Thank you Sergey

Claudio