When it comes to communicating with customers, email newsletters are definitely your best option. If your site is not built using a CMS like WordPress, it is difficult to find an efficient way of sending your newsletter.
Several customers are wondering how to ensure the delivery of their mass e-mailing to Gmail users. (Best practice) The way Gmail classifies spam depends heavily on reports from their users. Gmail users can mark and unmark any message as spam, at any time. To increase the inbox delivery rate of your messages, make sure that all recipients on your distribution lists actually want to receive the mail.