Then they picked out the eight email sign-offs that appeared over 1,000 times each and figured out the response rate linked to each sign-off. Here’s what they found:

"Thanks in advance" had a response rate of 65.7%
"Thanks" had a response rate of 63%
"Thank you" had a response rate of 57.9%
"Cheers" had a response rate of 54.4%
"Kind regards" had a response rate of 53.9%
"Regards" had a response rate of 53.5%
"Best regards" had a response rate of 52.9%
"Best" had a response rate of 51.2%
The average response rate for all the emails in their sample was 47.5%.