Collect messages from multiple email accounts

Hello. I have 10k Yahoo accounts and I want to see all the email messages sent there. I have checked mail collector for desktop email clients, but they stop working after adding less than 1k accounts. I tried forwarding those email accounts to 10 different yahoo accounts, but I can only forward about 30 accounts to one account. Im starting to think its impossible. Maybe there is some software that can scrape multiple accounts and show the emails in one place. Please let me know If you know any working way/ Thanks

It's quite difficult to find one that you need. Most of the ones available today really come with limits. Good luck in finding what you need, though.

All the ones I have used do not go that high either sorry and I have used allot

I found a way Thanks guys