Hi, I have been using Thunderbird for 3 years. It worked well in the past. However, Thunderbird failed to download an email yesterday. I can read this email both on website and my phone. The error message is as below: --------------------------------------------------------------------------- Retrieval using the IMAP4 protocol failed for the following message: 4319 Subject: xxxx From: xxxx Sent date: 9/23/2024 1:54:27 PM The message hasn't been deleted. You might be able to view it using either Outlook or Outlook Web App. You can also contact the sender to find out what the message says.