I am not sure that I understand your question. Is this the e-mail you need help with?:
Plase comfirm that the xxx symbol what dose it mean and it supplied by the contractor or another contractor.
The way I read it you are asking what the "xxx" symbol means? But what do you mean by "supplied by the contractor or another contractor"?
It is difficult to help you when I don't understand your meaning better, but these are my suggestions based on my interpretation of the text:
Please explain the meaning of the xxx symbol. Was it supplied by the contractor or another contractor?
Even with these corrections the meaning of your e-mail still isn't clear, but the language is now correct.
It would be better to ask "which contractor" or "who" supplied the symbol instead of using the word "contractor" twice.
If you still want to ask "what does the symbol mean" you need to correct the spelling.
Also, this is the correct spelling of "please."
If you can make your meaning more clear I would be happy to look at your e-mail again.
Student or Learner