Although I am one who prefers to communicate with MSCs through e-mail (and I find the constant Maritz phone calls burdensome and annoying), I think Mary is very correct that Maritz's e-mail policy is determined at the top. Maritz employees use the telephone, and, for the most part, shun e-mail because that is what they are instructed to do.
I do work for Maritz, like the company, and I self schedule. Perhaps if their frequent phone calls included bonus offers I would not find them so annoying. Almost all their calls are to let me know about assignments in my area at the posted price because they are not authorized to make a bonus offer. I find the calls annoying because I already know the assignment exists and what it pays, and if I wanted the assignment I would have self scheduled it. I have noticed they tend to beg me to take these shops when I decline, and often they argue with me - "it's not THAT far away" etc etc etc.....
If they ever do call with a nice bonus, I might think about it. In the meantime, I'll self schedule those shops that I want and ignore the massive number of unnecessary, annoying phone calls.