Finally i could use the Go Daddy email account as relay using the SMTP Authentication Support module in Drupal. I can send the testing email but it doesn’t work for those email triggered by the Ubercart module. This is because Ubercart has it own mail system so you have to tweak the setting such that it use the SMTP module to send email. This can be done by the Mail System module.
1. Download and install the Mail System module.
2. Go to the setting page @ admin/config/system/mailsystem.
3. Update the Cart module class, Order module class and Store module class such that they all use the SmtpMailSystem rather than UbercartMailSystem.
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