Question about contacting agents/agencies

I'm about to contact several agents and agencies this week. However I realized when I went on their websites, they don't have an e-mail address. I have done my research and a lot of articles say that you shouldn't call an agent or agency and that a lot of them only accept queries electronically. But, if they don't have an e-mail address does that mean you have to mail them your query ? A lot of the agencies and agents listed on Writers Guild of America East don't have e-mail addresses but just addresses and phone numbers. I even went on their sites, which don't tell you if you should e-mail or mail your query to them.
Would anyone advise that I can call them just find out where I can submit my query ? And if they only accept queries by mail, should I send them my screenplay or ask them in my query if they would like a copy of my script ?

I want to apologize for constantly asking questions that some may deem naive or already asked. I am fairly new here on Absolute Write Water Cooler and I am just starting out so I could use all the help I can get. We all have to start some where.

@clockwork thank you so much
A lot of the articles I read didn't say that. I just hope they don't get rude when I ask them what is their policy on submitting a query for representation. I guess I got to stock up on some ink.
If they are interested do they call you or write back to you that they want you to send them your script ?

Thank you very much brianjanuary

I called a good handful agents this morning that The Writer's Guild of America provided and apparently I got the old list. A lot of the people I called don't accept screenplays anymore and some even retired. I called the WGA and she gave me a new list but again, a lot of them are not accepting screenplays anymore. Would it be advisable to contact agents in LA ? I am starting to think these so called New York screenwriting agents honestly don't exist.
I am going to try the Backstage, thanks brianjanuary

@Melville: I am very passionate about getting my script out there. I have put my heart, soul and tears into this screenplay, needless to say I did worked hard on my other scripts but I feel this my strongest and I want to do whatever it takes to see it green-light. It may not be Oscar worthy but it's funny, different and original. I am not sure how much detailed we are suppose to give about our scripts when it's not posted in the section where everyone gives opinions on others stuff. Everyone as a story to tell, the old Hollywood saying to screenwriters, so what makes mine so different ?, well I am not a cocky guy so that would depend on the reader. As I mentioned before in one of my other thread's, I wrote this script at a time where everything wasn't going right in my life so it has a special meaning.

Have I wrote a rockin' query letter ? I have no idea. I have done research and looked at models of other query letters and at the same time I added my originality. Some sites tell you to writer a query letter as if your taking to your friend. I read one article where this female author wrote a query letter to someone to get her book published and added sarcastic humor to it the moment after she typed Dear. Oh and I hate the Lakers (the basketball team) was the ending to her letter. Just to give it an example. Others say it is imperative you keep it professional.

Can you please send me a link or some info, whether it be here on this thread or in a PM the query blasting services ? I can't find anything in regards to that on the web.

I never did something like this before which is why I keep asking these questions. I can read a lot of articles online but everyone of them may seem the same but all have a different approach. Do this but don't do that, do that but don't ever do this.

I figured maybe there is someone on here who can explain the do's and dont's as simple as possible to me. I wouldn't be humbugging everyone if I wasn't serious. Have this be something I wrote in my free time or something I wrote that I say "yeah, eventually I would like to see it get made" then I wouldn't be making it my goal to find a producer or an agent.

I am taking contests into consideration but that's a later approach. Only because I want to find one that fits the genre of my script. However those are risky considering you giving your hard earn money and it's a 0-100 chance you win. But at this point I'll do anything as long as I don't get scammed.

I totally agree with Melville. But that's why I feel that this particular script is my strongest. I have read a lot books from Story to Screenplay (Syd Field) to Gotham Writing Workshop and have taken several classes etc. I am very familiar with plot points