The overwhelming consensus is that guaranteeing 99% email deliverability with automated tools is not possible and should be viewed with skepticism. Deliverability is influenced by a complex interplay of factors, primarily controlled by the receiving end (ISPs, spam filters, user behavior). Claims of such guarantees often involve misleading tactics or inflated metrics. Instead, a focus on building a positive sender reputation, implementing proper email authentication (SPF, DKIM, DMARC), maintaining a clean and engaged email list, and creating valuable, relevant content are the cornerstones of a successful and sustainable email marketing strategy. Automation can assist with some aspects, such as list management, but it cannot override fundamental issues like poor sender reputation or unauthenticated emails.