https://slack.zendesk.com/hc/en-us/articles/203457187-Setting-up-a-custom-message-retention-policy https://slack.zendesk.com/hc/en-us/articles/203457187-Settin.

https://slack.zendesk.com/hc/en-us/articles/203457187-Setting-up-a-custom-message-retention-policy https://slack.zendesk.com/hc/en-us/articles/203457187-Settin... It's configurable for paid accounts, and can be set as low as one day. However, one of the best features of slack (and products like slack) is message history and search. Otherwise, IRC isn't all that different (WRT messaging).