Wayne Cook, 45, of Robert Street, Hindsford, was found guilty at Manchester Crown Court of two offences under the Anti-Terrorism, Crime and Security Act 2001.
At an earlier hearing, Steven Kerr Robinson, aged 42, also of Robert Street, Hindsford, pleaded guilty to two offences, also under the Anti-Terrorism, Crime and Security Act 2001. His plea can now be reported on following the conclusion of the proceedings against Cook.
advertisement The charges relate to two packages Robinson and Cook sent to a journalist in Scotland and a councillor in Blackburn.
The packages had miniature vodka bottles in them containing a highly concentrated dose of a potentially lethal chemical sodium peroxide.
In a more diluted state sodium peroxide, also known as caustic soda, is used as a heavy-duty cleaning chemical.
But the concentration found in the bottles sent to the two victims was such that if even a small amount had been drunk it could have led to death.
The chemical can also be very dangerous if handled without protection.