email,Name
name1@gmail.com,name1
name2@gmail.com,name2
name3@gmail.com,name3
name4@gmail.com,name4
name5@gmail.com,name5
name6@gmail.com,name6
name7@gmail.com,name7

name1@gmail.com
name4@gmail.com
name6@gmail.com

findstr @ mail_list.csv

findstr @ mail_list_to_remove.csv

findstr /g:mail_list_to_remove.csv /f:mail_list.csv

FINDSTR: Cannot open email,Name
FINDSTR: Cannot open name1@gmail.com,name1
FINDSTR: Cannot open name2@gmail.com,name2
FINDSTR: Cannot open name3@gmail.com,name3
FINDSTR: Cannot open name4@gmail.com,name4
FINDSTR: Cannot open name5@gmail.com,name5
FINDSTR: Cannot open name6@gmail.com,name6
FINDSTR: Cannot open name7@gmail.com,name7