She says there's two reasons for this — one being it signals the person really wants the job, and the other being how someone presents in interviews may not translate to effectiveness in the role.
"While sending a thankyou note doesn't necessarily guarantee the person will be a good hire, it gives you the tiniest bit more data: The candidate is eager, organised, and well mannered enough to send the note.
"It shows resourcefulness, too, because the candidate often has to hunt down an email address the interviewer never gave them."
The piece sparked a furious backlash after Liebman shared it on Twitter, with many people suggesting it was an entitled approach to take to interviews.
Many users also wondered whether Liebman sent thankyou emails to interviewees for taking the time to meet with her:
But others agreed with her approach, saying sending thankyou emails is a professional and courteous thing to do.
In 2012, Liebman wrote a similar article detailing her expectations for thankyou emails.
She said the interviewee should thank her for taking the time to talk with them, restate they wanted the job and add a quick plug about why they would be perfect for it.
She said if she didn't get an email like this, she would "assume you don't want the job" and "think you're disorganised and forgot about following up", adding "there is a much higher shot I'll forget about you".
News.com.au has contacted Liebman for comment.