Best email warm-up service? (unbiased)

There's no single "best" email warm-up tool for everyone, it depends on your budget, sending volume, and how much automation you need. Here's a breakdown of the top players:

• TrulyInbox – Great for sales teams who want fast, automated warm-up with deliverability monitoring built-in. Supports unlimited warm-up accounts in higher plans.
• Mailreach – Known for detailed warm-up analytics and advanced deliverability insights.
• Folderly – Enterprise-grade option with a deliverability audit service alongside warm-up.
• Warmbox – API-first warm-up tool, ideal if you want to integrate warm-up into your own platform.
• GlockApps – Offers warm-up as part of a broader email testing suite.