Earning some money with cl doing emails tips

Hi i just wonder if someone knows how much u have to spin the text and subject for the mail to come into other persons inbox.Atomic mail sender has a feature there u only insert a different word in each mail is that realy enuff to go thru in masses with just one word differance?
i sended 20 mails yesterday and all seemed to inbox,anyone have any tips about getting cl mails to inbox in larger scale?
(iam switching between gmail,yahoo,aol and switching ip with a bot)