I have prepared brochures and intend to mail them to specific local businesses to target new work. How should I address them? By this I mean should it be "Attn: manager" or should I call first to try and get an actual persons name? Does it even matter? Should I put them in envelopes so they aren't immedately pitched as "junkmail" before they're even read? Any insight is greatly appreciated. What has been your most effective marketing strategy?