Problems with these messages. See below

[Nigel Henry]

I'm getting messages identified as No Subject, with no To, From, or Date, and 
bogofilter is having problems with them.

Example below.

I can't even send the example spam, as my ISP appears to be blocking it
Suggestions as to how to deal with these would be appreciated. Bogofilter 
version is 1.0.2, and is dealing with all other spam with no problems.

Nigel.