This phrase doesn't make a good beginning of your cover letter. (prime-resume.com)
These few sentences at the beginning of your cover letter will determine whether the hiring manager will read on. (uptowork.com)
You can even play it safe by writing at the beginning of your cover letter: «I noticed you're working in [whatever department] at [whatever company],» so you show that based on your research, it looks like they're involved in the hiring process. (businessinsider.com)