People were getting texted two and three times because they were on more than one list—e.g. Website Users and Website Customers.

When someone buys, they’re added to the Customers list but never removed from Users, so the same campaign hits them multiple times.

The platform’s built-in “remove duplicates” only works inside a single list, not across lists.

Proposed Solutions

Add a feature to automatically detect and remove duplicates across all lists, not just inside one.

Allow an automation rule such as: When contact joins Customers → remove from Website Users.

When sending a campaign, give the option to exclude any contact who’s also in another specified list (dynamic suppression segment).