The Mailing_OnReceiveMail event occurs after a message has been accepted. The mail message can be accessed using the intrinsic Mail Object.
Sub Mailing_OnMailReceive
. . .
End Sub
Sub Mailing_OnReceiveMail
    ' Create
a backup of the received  message
    Dim NewMail
    Set NewMail = Mailing.CreateMail(Mail)
    NewMail.Receivers.RemoveAll
    NewMail.Receivers.Add , "backup@mydomain.com"
    NewMail.Subject = Mail.Subject & " Received on:
" & Now
    Mailing.SubmitMail NewMail
    Set NewMail = Nothing
    ' Forward the original mail to the
sales department
    Mail.Receivers.RemoveAll
    Mail.Receivers.Add , "sales@mydomain.com"
    Mailing.SubmitMail Mail
    Mailing.RemoveReceivedMail
End Sub
A mailing project can listen to more than one incoming queue, mails arriving from all queues will trigger this event.
Mailing_OnAcceptMail, SubmitMail, RemoveReceivedMail