sub _import_maildir { # maildir_each_eml cb
my ($f, $kw, $eml, $sto, $set_kw) = @_;
$sto->ipc_do('set_eml', $eml, $set_kw ? { kw => $kw }: ());
sub _import_maildir { # maildir_each_eml cb
my ($f, $kw, $eml, $sto, $set_kw) = @_;
$sto->ipc_do('set_eml', $eml, $set_kw ? { kw => $kw }: ());