I have downloaded trial version of Bulk Emailer. we are almost at point to buy product. But due to one issue we are still strucked. Problem is that i have made one compaign and send it to local domain email and also other yahoo, hotmail or gmail etc. For local users it reaches fine but for other domain it give me following error in log,ChilkatLog: SendEmail: DllDate: Jan 29 2010 UnlockPrefix: NTRACWMAILQ Username: ASPNET Component: .NET 2.0 Recipients: NumTo: 1 To: firstname.lastname@example.org NumCC: 0 NumBCC: 0 Sending RSET command.. Using existing/open SMTP connection to send email. ConnectionType: Unencrypted TCP/IP subject: test Compaign - 1 reversePath: email@example.com recipients: 550 5.7.1 Unable to relay for firstname.lastname@example.org Fail I have setup SMTP with basic authentication with user name and password.