My verdict: the French alternative to premium warm-up.
Mailwam gets the job done for less than the leaders. Perfect for tight budgets. Simple and efficient French warm-up solution to prepare your email inboxes.
Mailwam does automatic warm-up by sending/receiving emails between network members to build your reputation. Less known than Mailreach or Lemwarm, but functional and cheaper. Starting at 19 euros/month per inbox. If you want a French alternative to leaders or have a limited budget, Mailwam gets the job done. But for serious use, Mailreach remains the reference.
What I like less: the smaller warm-up network than leaders (less diversity in received emails). Less advanced features. And lower notoriety (less feedback available).
My advice: if you have a limited budget or many inboxes to warm up, Mailwam is a solid alternative at 19 euros/month. For your main or critical inboxes, invest in Mailreach. Mailwam can serve for secondary inboxes or as a starter solution.