[maildropl] pattern options "w"

[email b. <ema...@ya...>]

Hello,

  Looking at an older .mailfilter file I see a pattern with a ":w" option.  I 
don't see this in the manual page at 
http://www.courier-mta.org/maildrop/maildropfilter.html but maybe it's an 
allowable PCRE option?  Does it do the same as ":hb"???

Thanks