signal to noise

A few days ago I sent a request to co-worker saying "please do XXX -- but not until friday." He handled the request immediately, and when I asked him about it, he said, "You think I read all your mail?" It would be ridiculous to complain about a request being handled too fast, and that this co-worker is way on top of his game, so probably the miscommunication came from me. I send so much email to internal and external team mailing lists that it is entirely understandable that a few important nuggets would occasionally be missed. Could I send less email and be a more effective team member?
Andy van Dam is legendary for his use of ultra-compact email replies:

• tnx -a


• ack. -a and ok -a


• see me -a and its more intimidating cousins see me pls and call me.


• tmrw and do it and ask lsh are also frequent fliers.

With these eight-letter messages, Andy runs several small empires. What can I leave out of my email compositions to be more effective?