# Exim filter

if $h_subject: is "This is a very long string which isn't likely to occur when\
  testing for a fixed string, but might happen if a long and complicated\
  regular expression and/or lookup gets used in somebody's filter file.\
  Originally the limit was 256 characters, but now we have increased it to\
  a larger figure. This should exceed the old limit and check that the new\
  limit is in place."
then
  testprint "Won't happen"
endif