Just wanted to drop a line and say I'm also facing this issue with AOL (which is owned by Yahoo now). They provided the following troubleshooting steps for the admins of Permies:
What you can do:
Contact the permies.com support team and let them know that:
Their emails to AOL addresses are being bounced back
They need to submit a request to AOL Postmaster to restore delivery
Provide them the link:
https://senders.yahooinc.com/contact/
Unfortunately, there's no setting on your end that can override this server-level blocking. You can find more information in the article Why can't I send mail to AOL Mail users?