Hi
At the outset, let me clarify the last question you raised first. It is up to your comfort level and based on the corporate policy if any, to disclose your current employers name when interacting on these sites. In my view it is safer not to disclose, so that you can freely and frankly raise issues which may be ticklish from a corporate perspective or which could be viewed as being critical of your current job/ bosses/ management etc.
As regards improving your email communication, I would stress that the improvement of your communication skills is more critical. Email is just one popular and extensively used medium of communication which may have some peculiarities and requirements which can be worked on separately.
In my view the most important element in any form of communication is the clear understanding of what, how, and why you are communicating. This can be clearly understood by ensuring that you write the subject line of your communication even before you begin writing anything else.
Then ensure you follow the rules of good drafting, editing and proof reading. These could include one idea per para, flow of thoughts, use of punctuations, following the 5'c of effective communication etc. Ideally I recommend that all communication be typed in WORD, thereafter proof read and then as required cut and paste.
As a habit/ practice ensure that for all forms of communication even casual communication, the content is well drafted, the sentences and paragraphs are formed using all the rules of grammar and effective drafting skills. You would notice that more and more people are using the SMS language, using short forms, jargon, liberally tossing out the rules of grammar when they post matter in this site. If one gets into this routine, the quality of formal communication would suffer in the long run and this would be evident in the letters, reports, emails, inter office communications, circulars etc. that one generates.
You have also stressed on wanting to be more positive, proactive and prompt in your communication. This can come about if your own attitude, behavior and interactions always reflect these traits. Try to minimize the use of negative words like no, can't, difficult, etc. even in every day communication.
When it comes to emails the first rule is not to keep marking copies to one and all. The second rule is to ensure that the communication is crisp and not very lengthy. Revert to incoming emails at the earliest.
To help you be more positive I would invite you to visit the following Inspirational and motivational Blogs
www.actspot.wordpress.com - Over 69,000 views and 490 followers
www.poweract.blogspot.com - Over 19,000 views and 145 followers
Best Wishes