主题：Retrieval using the IMAP4 protocol failed for the following message:315
The server couldn't retrieve the following message:
Subject: "Not available"
From: "Not available" ("Not available")
Sent date: Not available
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.
平均每天2-30封这样的邮件，发件人：Microsoft Exchange。