I am engaged in email marketing, but about a month ago I ran into an unpleasant problem - the income from mailings very strong sagged. Earlier, on average, it was possible to get $ 300-500 from mailing to mail base of 100,000 mails, after the base burned out only 100-150. I asked around by chats - it turned out
that the quality of email databases is very important, that is, it is necessary to pe |