The extremely first email was sent in 1971 by a computer engineer named Ray Tomlinson. The concept he sent was merely a string of numbers and letters, but it was the start of a brand new era of communication. Email marketing isn’t an invite to send emails with reckless https://www.upwork.com/services/product/development-it-email-deliverability-inbox-reduce-spam-dns-issues-fixed-dkim-spf-dmarc-1378055073774727168?ref=project_share&tier=0