[Pkg-exim4-users] Problems concerning IPv6 Port 25's opening to the Internet

[Florian Weimer]

* Satoru Otsubo:

>  Why is Port 25 shown as "filtered" ?

Your ISP might do this as a countermeasure against spam.  This is
probably not an Exim-related problem.

What does "netstat -an | grep LISTEN" show?