is($uniq{$mid}++, 0, "MID for $num is unique in XOVER");
is_deeply($n->xhdr('Message-ID', $num),
{ $num => $mid }, "XHDR lookup OK on num $num");
is($uniq{$mid}++, 0, "MID for $num is unique in XOVER");
is_deeply($n->xhdr('Message-ID', $num),
{ $num => $mid }, "XHDR lookup OK on num $num");