Hi, same here. Unable to download, the file is missing. Error: Not Found Sorry, we couldn't find the page you were looking for. Please check the web address, or try again later.

Thanks for mentioning this. Users are experiencing this issue on different IMAP servers, like Gmail or iCloud. I am also affected by this and only use iCloud Mail servers. The strange thing is: emails cannot be received, or the Mail app hangs for an extended period before finally receiving emails. I can also observe this behavior on macOS 15.2. I troubleshooted the issue and in my case I found some dependencies on Private Relay. Normally, PR is not used if the device receives an NXDOMAIN response from the DNS servers for the masking URLs of Private Relay. Many companies block these URLs to prevent bypassing their infrastructure. However, it now seems that this is not working as expected. I can see a massive increase in retries to resolve these domains, which are still being blocked by our backend infrastructure. In the end, many devices run into issues with mail delivery. Bypassing the PR URLs is a workaround, but in most cases, it’s not a suitable solution.