If your file is already formatted with a commercial word processing program just send it. I can translate most file formats. Sending your file as TEXT will result in the loss of all formatting. I can also expand most compression formats therefore files can be compressed to save server space and speed uploads. . Probably the best way to provide the above information is to include it at the bottom of your file.
Email is preferred.
I am going to assume that documents sent for posting do not violate any copyright laws. Let's all try to follow the Golden Rule.