I had to stop using this product...There is no response from support.
It worked the first few times and then it would send all emails to, Hello Dhiraj, despite my spreadsheet having a pre-populated FIRST NAME column. It was so embarrassing.
So, I blew away my underlying Google sheet and I thought starting from scratch would reset everything...I created a new email list to 3 of my alternate email addresses to run a test....the FIRST NAME column was populated in each row. Once again, all emails were sent out to a different first name that wasn't even on my list.
I reached out several times to YAMM support. It's been 6 weeks, no response whatsoever. My conclusion is to always buy quality and with a vendor where you can get support.
Do not use this product. Invest in a quality tool.