When writing a letter of interest, how important is it to know who will be reading it? I'm applying to CVS online, and I'm unsure who to address my letter of interest to. Is it really considered bad form to use 'To Whom it May Concern'? I've searched online for who might be the hiring manager, but didn't have any luck. I don't know how else to get the information without calling one of the stores in the zipcode listed for the job... and even that seems like it would be iffy. Advice?