OT: Strange Outlook express behavior

[Eperez]

I'd like to know if anyone in this this has had any problems with  Outlook
Express not being able to send the read-receipt because the email address
gets mangled like this:(example)
testing at testing.com
sometimes get changed to
testing at testin.g.com or testing at test.ing.com

The thing is that the domain name gets mangled with a random dot. Sometimes
the read receipt gets delivered and sometimes this weird thing happen.

Im using sendmail/mailscanner/outlook express in a RedHat Advanced Server in
Cluster edition.

Could it be a virus/trojan or a sendmail screw up? I tried checking the
online virus database from trend but the dont have a search  based on
behavior. Any links will be welcomed.

Id like to  point out that im sure its no  MailScanner problem because I
disabled it and the strange behavior continued. Funny thnig is that this
happens randomly. Today happened maybe it wont tomorrow, etc...

Your comments will be welcomed

Thanks,
Erick.

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