Yahoo! Mail IMAP Download Limit Issue

I recently realised that on my Mac doesn't show more than 10000 messages in Yahoo! Inbox. I thought, it could be issue with, and I configued Thunderbird to download Yahoo! mails, and even Thunderbird couldn't download more than 10000 messages.

I searched around to learn if YahoO! has changed something; indeed they have. It seems with their regular two-way sync IMAP you can only download 10000 messages in Inbox (or per folder) using third-party mail software (, Thunderbird, etc.).

Yahoo! provides a way to export messages (one way) via a different IMAP.

We need to change the IMAP server to; and we can download all messages. You can learn more about this here.