copierdirect.ca just got me my first lead after being up for less than 3 months.
In my opinion, email blasting is not effective unless the customer chooses to opt-in.
Fax blasting on the other hand is much more effective. I use a PC Fax driver to organize businesses by vertical. Then I send out a mass fax with relevant information.
Emails are easily deleted, but faxes have to be read before they are thrown out.
I wouldn't buy a house or a car from a random guy who sent me an email. Better to use email and faxing as a way to generate customer rapport online.