Error in Maillog : Failed to create message structures ..

[Ashok kumar]

Hii ,
I am constantly getting this error message in maillog "Failed to create 
message structures for AA477784ED.CE0AA, dropping it from the batch". 
Can any one
please tell what is going wrong and how to overcome such problem.

I am using Postfix, MS and SA setup having following version.

Postfix : 2.2.5
MailScanner : 4.44.6
SpamAssassin : 3.1.0

I hope some one respond immediately ......


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