You can certainly put in place email workflows with marketing automation. All you have to do is make your emails, established triggers and hold out times, then sit back and let the automation software do the major-lifting. The beauty of SMTP is usually that it’s an open up protocol. 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