thanks for the reply. Solve the problem with a "smart host" (socketlabs), but as I go along I get new problems. Now, for some reason my server no longer receives emails. I can send without problems, but now there are no entry logs, I don't see them in "live log" (before I saw them without problems). I think the problem is with the router (arris). To rule out the QNAP problem, install the server on another PC and the same thing happens. can you guide me to find the solution?
qnap port or router to check ?? .. any settings on freedns.org ?? any blacklist of domains?