[vps-mail] procmail escaping of non alphanumerics

[Sikaspam <sikaspam@xxxxxxxxxxx>]

This is getting to be a huge (pardon the pun) spam source for us:

(^*G;ET*,"BI;G^;PE.X*X;S. qtbnthba)

I'd like to add a procmail recipe to detect too many characters like 
carrot, backquote etc (or alternatively to accept mail only if it has a 
high percentage of normal characters. Procmail has, IIRC, a lot of 
exceptions in escaping control characters. The above example has 3 
semicolons, two carrets, two asterisks and two periods. (I put an X in 
place of the two characters N and I.)

What suggestions does anyone have to make a signle recipe using the most 
efficient regexes?

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