Document version not creating for emailed text file documents

Hi,

Email documents (.txt file) not creating versions when we update metadata information.

Test Scenarios I

Add new text file (Sample1.txt) in document library

Enter Metadata Information based on Content Type

Click on Save ( Version 1 created successfully).

Edit Properties --> Change the metadata values --> Save ( version 2 created successfully)

Test Scenarios II

Incoming e-mail settings- configured email id.

Email documents ((Sample2.txt) received in the document library.

Documents saved successfully (version 1)

Edit Properties --> Change the metadata values --> Save ( version 1 updated with current value instead of version 2 )

Thanks,

Varatharajan Rathinasamy.