The most useful feature is being able to have an auto response system that can be used with your existing email systems without having too many extra costs or hassle of other programs like MailChimp etc.. This has been extremely helpful for me as I am very busy at work so it helps keep my time efficient by not needing go back into each inbox individually throughout multiple days! It also makes sure all emails we receive are responded in order which saves us from going through old mails again if there's something urgent but hasn't yet gotten responses/replieds sent out within our specified timeframe (usually 1 week). Sometimes you may get spammed when trying this program because they don’t know how best utilize their resources - meaning sometimes spammy looking templates will show up instead of more professional ones however once contacted about these issues via chat option available here everything seems fine after some explaining where needed.