No offence but what aload of pish! Not worth a punt no, specialy not at that price! And chances are, this is a con. Specialy if its an unsolicited email... i.e. they take the money and they tell you they bulk emailed those people. And even if they did actually email the list, a large potion of those will be dead emails or go stright to the spam folder.
Take a night off of here and you can easly come up with big lists of business to target and from YOUR AREA.
One last thing, the convertion rate with email marketing is very slim. Alot slimmer than leaflets, so 5000 emails is nothing.
From experance, it gets better if those people are highly targeted and they actually "opt in" to be emailed with special offers. But still the converstions aren't that great.