If the mark insists on sending me material cycling, golf and swimming all together in the same newsletter it more natural is which ceases to interest me don’t you think? And to you? 4 Test & learn – do thought that there was a formula for success in email marketing? Sorry to inform you that does not exist! In a same area of business, the way in which we manage the newsletters we receive can vary depending on factors of which we have already spoken here. To help you, there are tools like E-goi which allow to automate such tasks as trials of campaigns or election tests.. .