Message used to carry data... wtf?

[Inphektion]

A user is getting a lot of these messages. uses tmo on bes and with a bis setup. How do I stop it?

This message is used to carry data between the BlackBerry Handheld and an associated server. Please do not delete, move or respond to this message - it will be processed by the server.

BEGINETP 423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 300121239

[philhu]

I started seeing these too in my Exchange/Outlook mailbox

They stay there forever.

[BERDucky]

The following KB will resolve your issue:

http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/8021/270925/Support_-_Network@<hidden>?nodeid=1044911&vernum=0