Seller Nexus is an email automation tool for Amazon Sellers. Shipping is tracked so buyers receive emails at the correct time. Custom email triggers can be created, and automatic blacklisting excludes customers who have left negative feedback or asked for returns.
Seller Nexus sends negative seller feedback alerts, and can also track keywords.
Free 'Beginner' plan available. Paid plans from $12.99 to $79.99 per month.