and you will make a good impression if you send them all a thank-you letter. If you have access to the e-mail addresses of your interviewers, and if earlier correspondence suggests that they ...

It turns out your mother was right: as short as they are, thank you notes are incredibly important. Writing one could make the difference between getting the job or not, so don't leave it up to chance ...

would prefer that we send a single message, using “we” in the note with one person writing and each individual signing.