in reply to MIME:Parser vs. file permissions

Although it's true you may not know what the file names are until MIME::Parser is done, you do have the option of specifying where to store the attachments beforehand:
use strict; use warnings; use MIME::Parser; my $dir = "./mimemail"; my $parser = new MIME::Parser; $parser->output_dir($dir); my $entity = $parser->read(\*STDIN) || die "couldn't parse MIME stre +am";
You should have enough information at this point to change permissions on the directory or the files within it. Then again, maybe I misunderstand your question. The suggestion by davis should work in any case.