If you are still using CDONT component in your ASP application to send emails, you should update your code to use CDO. Below is a basic CDO script you can use to send emails. It's just a basic script, and you may have to customize it according to your requirements. You can find lots of web pages on the internet with more customizations and attributes with CDO.
<% Set objEmail = CreateObject("CDO.Message") objEmail.From = "FROM_EMAIL" objEmail.To = "TO_EMAIL" objEmail.Subject = "Test Mail" objEmail.Textbody = "Test Mail" objEmail.Configuration.Fields.Item ("http://schemas.microsoft.com/cdo/configuration/sendusing") = 2 objEmail.Configuration.Fields.Item ("http://schemas.microsoft.com/cdo/configuration/smtpserver") = "localhost" objEmail.Configuration.Fields.Item ("http://schemas.microsoft.com/cdo/configuration/smtpserverport") = 25 objEmail.Configuration.Fields.Update objEmail.Send If Not err.number=0 Then Response.write "ERROR: " & err.Description err.Clear Else Response.write "Email sent to " & objEmail.To end if %>If you run into any problems while using this script, you can contact AccuWebHosting support with the exact error message or URL.
Note: You should always clean your email list using email verification tool before starting an email campaign.