You cannot download and receive e-mail messages by using
Microsoft Outlook, Microsoft Outlook Express, or another POP3 client. The POP3
client may stop responding (hang) or time out when you try to retrieve your
This issue may occur if one or more of the messages contain
an incorrect POP3Tail, or termination sequence. As a result, the POP3 client
does not detect the termination sequence in the "corrupted" messages and cannot
complete the download of other messages to your Inbox.
To work around this issue, set the
value to 1. To do so:WARNING
: If you use Registry Editor incorrectly, you may cause serious
problems that may require you to reinstall your operating system. Microsoft
cannot guarantee that you can solve problems that result from using Registry
Editor incorrectly. Use Registry Editor at your own risk.
- Click Start, and then click
- In the Open box, type
regedit, and then click OK.
- Locate, and then click the following registry entry:
Note If the CheckPop3Tail
registry value is not present, create it. To do so:
- Locate, and then click the following registry key:
- On the Edit menu, point to
New, and then click DWORD Value.
- Type CheckPop3Tail, and then
- On the Edit menu, click
- In the Value data box, type
1, and then click OK.
- Quit Registry Editor.
: After you complete this procedure, Exchange checks the POP3Tail
of each POP3 message, and adds the correct termination sequence (if it is
missing). Because of this additional processing, you may experience a decrease
in performance in environments where there are many POP3 users.
The termination sequence for POP3 is CRLF.CRLF, as specified
in Request for Comments (RFC) 1939. To view RFC 1939, visit the following
Internet Engineering Task Force (IETF) Web site: