Problem Description
You receive an error from Apple Mail saying something similar to: "Attempt To Read Data From Server Failed"
Problem Resolution
This typically occurs when the number of simultaneous IMAP connections is configured too low on your server (could be total connections or per-IP connections). If you are operating your own VPS or dedicated server and using Plesk, you can follow the Plesk documentation here to increase the max number of simultaneous connections, both globally and per IP. The quick version is:
- In the Plesk admin, choose Tools & Settings > Mail Server Settings
- Adjust the Maximum number of connections and/or Maximum number of connections per IP address accordingly.
- Press Save
