Did you configure the default from email address in site settings to match the smtp user?
Did you configure an email address to receive notification in the contact form settings?
http://www.mojoportal.com/emailconfiguration.aspx
With no error it means it is either not sending any mail (if no email is configured in contact form settings it won't send anything), or no error is happening when sending mail but for some external reason the mail is not received (possibly blocked by spam filters if the from address in site settings is not the same as the smtp email account).
Hope it helps,
Joe