Normally I’d rather quote something sweeter from Lady Julia but she captures the essence of what to not send to a Domme in an email or instant message:
“Dear wife/girlfriend/woman I don’t even know: I want to submit to you. By wanting to submit to you I mean I want all my kinky sexual buttons to be pushed when I want and how I want without any regard for what you may want and without any real effort to please you or to even learn what would please you. When can you make this happen?”