Allow me to set it by doing this, with out an SMTP server, your email messages received’t get to your recipients. SMTP relay server support is simple-to-use. Combine it with your website and start sending transactional emails immediately There are some 3rd-party email validators around like ZeroBounce — or https://bookmarkshut.com/story17558093/new-step-by-step-map-for-powermtasend-email