now i am trying to create a summary of domain counts, i am trying like below but its very time taking , i am getting count of two domain count for lower case and upper case
domain count
HOTMAIL 1
hotmail 1
The problem is that tolower takes as its first argument the vector to be changed and when you put it in a chain with %>% you are passing it the data frame produced by filter() and then Email. Try this as your first step.