Email Marketing Software Market Size, Share and Industry Analysis, By Channel (Business-to-Business (B2B) and Business-to-Customers (B2C)), Deployment (On-Premise and Cloud), By Enterprise Size (Large Enterprises, Small & Medium Enterprises), By Application (Email Lead Generation, Sales Reporting, Customer Management), By Industry (Banking, Finance, Security and Insurance (BFSI), IT and Telecommunications) and Regional Forecast, 2020-2027