Thank you for the fast response.
I tried to describe the following:
The "normal" notifications have an other "layout" than the notifications createt from the auto notifications. The normal start with something like "New Thread"(in German^^) in the headline and the mailinglist notifications have only the Name of the Thread in the headline.
If I reply to a "normal" notification, there happens nothing, no new post, no new thread. If I reply to an auto notification of your mod everything is going fine.
So in the end I am only able to use your mod if I switch on the auto notification options of the mod.
At the moment I'm only testing my forum with multiple own accounts (in the past i alway used phpBB as Forum Software) and so there are no users, but to disable notifications in profile doesn't affect the mails of the autonotification of your mod. Otherwise I would do this.
Edit:
Now I tried the mailhook thing simply with a new mailhook, and posting suddenly worked for one new Thread (per account) and then again it didn't work any more... very strange
Also I noticed one other thing
: If I post a new thread through mail and the auto notifications are turned off I don't receive any notification, although I have enabled to get notifications about everything in the profile settings.