Which sentence is correct?
1) Sending emails is not good way to attract users - only 7% of users to whom we sent email landed on our website
2) 1) Sending emails is not good way to attract users - only 7% of users to whom we had sent email landed on our website
#1 is the better of the two. But as regards punctuation, don't get into the habit of using a lot of dashes. A period followed by a capital letter is better here.
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But as regards punctuation, don't get into the habit of using a lot of dashes. A period followed by a capital letter is better here. You also need a period at the end.
Say is not a good way.
Clive