I would personally avoid HTML campaigns if someone hasn't opted in yet (feels like spam and can harm your email domain reputation)
For cold outreach, I think best for outbound team to start with plain text emails
๐ Hey everyone, I'm Marcus Soulsby, a Marketing, Growth & Design Lead at SYSTM
๐ผ Industry: Treasury management for SMB's agencies
๐ I live in South-West London
Connect with me on LinkedIn - https://www.linkedin.com/in/marcussoulsby/ For fun: Ableton music production