Adili is using SmartMarketer eChannel, a digital marketing system that allows the user to create and manage email campaigns.
The retailer previously used of SmartFocus Digital software before moving all marketing over to an out of house team.
This approach proved too inflexible for Adili's marketing needs, and the company made the decision to bring its marketing back in house.
Rebekka Peake, marketing coordinator for Adili, said: "This solution has been brilliant for our in-house marketing team. We've all quickly mastered the software without any HTML or design skills knowledge.
"Part of the attraction of SmartFocus Digital is the continual developments that are made to the software. We send out up to 50,000 emails a month so having a comprehensive solution is very important."
Established in 2006, Adili sells ladies' and mens' fashions and home collections from 80 of the best sustainable and fair brands from around the world.
The site regularly keeps in contact with subscribers and customers by sending e-newsletters featuring the latest offers.
Bryan Black, sales director of SmartFocus Digital, said: "Adili returning to SmartFocus has been a great privilege for us.
"It really shows the strength of our digital marketing and proves that we can provide a solution that truly is easy to use in house but can also give you great return on investment, which is important to all businesses right now."