I use ISP2 for about 1 year, never had any problem.
It seems that now i have one... While trying to send an email, i discovered that the recipient hadn't received.
In the console, i discovered that there were about 8000 emails in queue
When running mailq, showed me this, executed postsuper -d ALL, cleared all, and sending/receiving back again. But,in about 1/2 hour, the queue is increasing again...
sender/recepient of this is firstname.lastname@example.org
What is wrong?