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Outlook Error 0x8004210E when trying to receive mail
'domain name - Receiving' reported error (0x8004210E)
: 'Your mailbox is temporarily unavailable because
another e-mail message is being delivered to it or
another mail application is accessing it. The server
responded: -ERR Can't get lock. Mailbox in use'
Under certain conditions (eg. network problems,
malformed email messages, more than one email client
being configured to poll the server) the lock file ( the
lock file is on our server ) which is used to stop more
than one person logging into the account at once, fails
to be deleted at the end of the pop3 session.
The Solution: If there is no further activity on the
POP3 mailbox, usually within 15-20 minutes it will be
unlocked automatically.
It then prevents you from logging in again,
generating the Outlook error above.
If you experience this problem, please make sure that
you don't have more than one email client configured to
check the same account.
This error can also occur if the message being
downloading is malformed, and the client computer has
anti-virus or anti-spam software running (such as McAfee
or Nortons Anti-virus). The software installed on the
client has problems with interpreting the email and
doesn't finish, and doesn't try to download the next
message from the server.
To resolve, the anti-spam or anti-virus software has
to be disabled if not at least to diagnose and debug. In
some cases a single message could be holding up the
download on the client firewall end, once this message
is removed or let through by disabling as previously
mentioned every thing can be resumed as per the previous
configuration settings.
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