I have tried Litmus on 19th of march with my Zoho Campaigns, but without any luck. My test was refreshing all the time, loosing all of my credits.

When I sent this to Zoho support, they said they are working on this. And then, the communication is dead.
I tried Litmus support with the same question, but I received a default reply only. No real person has answered yet.

Is this a problem with Litmus, or a problem with Zoho?

Please help, I want to use Litmus for my mailing.