confirm forwarding on yahoo emails

We have a list of about 1500 yahoo emails that have been forwarded to "mail A" but still need to click the confirmation link to complete the forwarding. Therefore you need to log into each yahoo account, then click the right link in "mail A" inbox and go to the next account. Problem is that for some of the yahoo emails there are 2 confirmation emails in the inbox. One is wrong, one is right, so here you have to do it twice sometimes. Of course all this should not be done by hand but by script and on a powerful server. I need al this done tomorrow.