Ask HN: Trello as a lite CRM for early sales?

Hi all, I'm a software entrepreneur. Type12 is my third SaaS business (one got shut down, one got acquired), and I've always struggled using Trello as a lite CRM to track the first leads and sales (between 0 and 10k MRR). I'm curious, what are you using to track leads and send cold emails? I thought that for those that start using Trello to organize leads, would be extremely useful (or at least to me) also being able to send cold emails directly from the Trello sales board. I just thought I'd productize this into a Trello powers-up: https://umbrello.xyz/ Is anyone here interested in this?