cdo.message mail component not working

[arulmurugan77]

Recently moved from windows mail server to Zimbra mail server 6.0.1

ASP cdo.message mail component not working in Zimbra for mail ids other than same domine.

Error error thrown: 0x8004020F

Mail component settings :
smtpserver = "mailserver.mydomain.com",
smtpserverport = 25,
sendusing = 2,
smtpauthenticate = 1,
smtpusessl = True, [window server smtpusessl = False] only difference in code
sendusername = "valid_username" ,
sendpassword = "password"