(Hillsboro, OR)  --  The FBI and other agencies are investigating suspicious mail that was received yesterday at government offices across Oregon.  Officials say the mail was received at offices in Washington, Grant, Umatilla, Jackson, Sherman, Wasco, and Baker counties, and some of the mail contained what's being called an unknown substance.  Grant County Sheriff Glenn Palmer was taken to a hospital after opening an envelope addressed to him at the Canyon City sheriff's office.  Authorities say the envelope contained a white substance, and moments after it was opened, Palmer developed a rash on his arms.  The FBI says it's too early in the investigation to release more details on the suspicious mail.