Mailinglist Archive: opensuse-security (547 mails)

[Volker Kuhlmann <kuhlmav@xxxxxxxxxxxxxxxxxxxxx>]

Hello all,

I have a problem with mail relaying. Testing my machine (at home)
with the test at http://www.abuse.net/relay.html, I found that it was
indeed relaying. That was a surprise, because I thought I had a default
configuration and that the default would not allow relaying.

I selected "host with permanent net connection" in yast. In order to
get things going, I had to set

FROM_HEADER="elec.canterbury.ac.nz"

in rc.config, which leads to a 

DMelec.canterbury.ac.nz

line in sendmail.cf. Without this, email to kuhlmav@xxxxxxxxxxxxxxxxxxxxx
leaves my host (as /var/log/mail shows), but never arrives - presumably
because the university's mail gateway cantva.canterbury.ac.nz trashes it.
I remember having had problems before if the sending host's (mine)
FQN doesn't resolve (although it seemed I can put anything I want,
as long as it resolves).

How can I configure things to make email work, but block relaying?

Thanks for any help,

Volker