Using ZonGuru’s Email Automator you can email all of your customers up to 60 days in the past. This can be a fantastic way to notify past customers of new or other items that you have for sale on Amazon.
That being said, you should consider Amazon’s terms of service. You have to be careful to make offers are relevant to the original order they placed with you. This is of course subjective, but you should know that there are guidelines around what you can and cannot send customers. We strongly recommend that you defer to Amazon’s term of service and make your own decisions around this.