JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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First you will need to delete your current email, you can do it by following this guide : http://www.jotform.com/help/241-How-to-Edit-Delete-Sender-Emails-on-SMTP-Settings
Then, just add the settings again : http://www.jotform.com/help/244-How-to-Setup-SMTP-for-a-Form
You should be able to use your new SMTP now.
Feel free to contact us if you need help.