One of the biggest and most common cover letter mistakes people make is not taking the time to customize their cover letters and grab the attention of the hiring manager. (resumehelp.com)
The most common cover letter mistake that leads to qualified professionals being passed over for interviews. (maryelizabethbradford.com)
Other common cover letter writing rules are guidelines to help you build a readable document, so if you have a good reason to break a rule, you can do it. (livecareer.com)