Not all text is created equal. Faxes are fine. That results in a higher-quality printout on the receiving end. Don't send your r sum as an attachment. Paste it into the body of an email message.
Most employers ignore attachments.
They worry about viruses, and they don't want to waste time with files that their computers can't translate. Always include a subject line. If you're responding to a specific posting, put the reference number in the subject line. If you're submitting a r sum to a database, include a description of your skills in the subject line. It's not a subject line.