ASP Email Question

I am using this following code to send email via classic asp.

It all works fine if I use the correct mailFrom... but In case I change the fromEmail, it doesn;t work. I need to send invites in my application and the from email should be the agents email address and not my site's email address. Is there any way I can change it>

		Sub sendEmail(mailFrom, mailTo, mailSubject, mailMessage, mailServer, mailUsername, mailPassword)
			Set MyMail = CreateObject("cdo.message")
			MyMail.From = mailFrom
			MyMail.To = mailTo
			MyMail.Subject = mailSubject
			MyMail.HTMLBody = mailMessage
			MyMail.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/configuration/sendusing") = 2
			MyMail.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/configuration/smtpserver") = mailServer
			MyMail.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/configuration/sendusername") = mailUsername
			MyMail.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/configuration/sendpassword") = mailPassword
			MyMail.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate") = 1
			MyMail.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/configuration/smtpserverport") = 25
			MyMail.Configuration.Fields.Update
			MyMail.Send
			Set MyMail = nothing
		End Sub

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