MailRush.io is a cold email software. This tool provides cold email automation for follow-ups using its proprietary SMTP service. As a Cold Email ESP for B2B outreach, MailRush.io is different from any other cold email automation tool. No other tool will include email service with shared or dedicated IP options. This mix of software automation and email service provides full control over the reputation of the sender domain. Email validation and email warm-up are included in all plans.