$net->imap_each($self->{uri}, \&_imap_augment_or_delete,
$lei, $lse, \$delete_mic);
$delete_mic->expunge if $delete_mic;
} elsif (!$self->{-wq_worker_nr}) { # undef or 0
# clobber existing IMAP folder
$net->imap_each($self->{uri}, \&_imap_augment_or_delete,
$lei, $lse, \$delete_mic);
$delete_mic->expunge if $delete_mic;
} elsif (!$self->{-wq_worker_nr}) { # undef or 0
# clobber existing IMAP folder