Authentication problem Windows asp
I am helping a friend who has a Windows asp website. It has been moved from a previous host and uses Universal Email for sending emails from contact forms. There are a few contact forms on the site and all of them are not working. When completing a contact form and clicking submit, it then come up with the following error:
Persits.MailSender.4 error '800a0006'
535 Authentication failed
/WA_Universal_Email/AspEmail_VB.asp, line 151
As I say this is a asp website not php. I have scanned this forum but have not found any answers. Please can anyone help with what is causing this error and how to fix it.
Thanks in advance.