When a subscriber replies to your letter, we’ll automatically pull it into your TinyLetter account, where you’ll see a notification for any new replies waiting for you. Just click the Replies tab to view the subscriber’s message (and, if you want, write them back).
If you also want to receive these replies in your personal inbox, go to Username > Your Profile > Account Settings, select the checkbox for Send replies to my email address, then scroll to the bottom of the page to Save Profile.
Yahoo and AOL have made changes to their authentication policies which prevent emails from being sent on behalf of an @yahoo.com or @aol.com address outside of either service.
Due to these changes, replies from @yahoo.com and @aol.com addresses are not forwarded to your inbox. They will however still appear in the Replies tab of your TinyLetter account.
Read more about how Yahoo and AOL changes to DMARC may affect deliverability