Hi Viktor, > On Apr 7, 2018, at 1:32 PM, Viktor Dukhovni <postfix-us...@dukhovni.org> > wrote: > > It is now portable POSIX. For the record, in email the allowed whitespace is > more narrow than > is recognized by [[:space:]], you're not likely to run into any false > positives. The email > header whitespace consists of just SPACE, TAB, CR and LF. VT and FF > (vertical tab and form feed) > are not valid whitespace in email headers.
Ok, great! Thank you for those observations about whitespace Thanks to everyone else on this thread who also provided examples and suggestions. Going forward I will take the advice to install PCRE support. - J
