I'm sorry I have not responded earlier, looks like I did not get any notifications, I will look into my forum settings. I apologize for this.
Thanks a lot for thinking about this problem. It is good to see something like this is picked up by advanced members to discuss and educate.
As I understand correctly everything works fine with mailhosts disabled. I guess we should check our mailhosts anyway, because of recent network changes.
So, how should we interpret this?
The mailhost check code of SC "crashes" when it tries to parse a host with a dot, - and could be fixed - or
The mailhost check code "crashes" when it tries to parse a host with a dot, while the mailhost setup for the particular reporter is out of date (but as I get it, other people, with different mailhosts, experience the same issue),
We should not use mailhosts as it crashes stuff
I will now first reconfigure our mailhosts, and see what happens. I will keep you posted!