Finally i could use the account as relay using the SMTP Authentication Support module in . 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 @ .
3. Update the , and such that they all use the rather than .
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