If you intend on mass emailing the exact same contacts frequently and you also intend to make factors a little extra manageable yourself, it’s encouraged that you simply insert your contacts into Gmail possibly manually or as a result of importing. Since we’ve included how you can build SMTP, 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