On Mon, 20 Nov 2006, Leon Kolchinsky wrote:
> Hello,
>
> There is a Mail-Relay administered by another person and its MX record stand
> before MX record of my mail server, so theoretically mail should go first
> through Mail-Relay to my server.
>
> The thing is that for some reason there are much e-mails (and spam among them
> of course) getting to my server directly and not via Mail-Relay.
>
> What could be the reason for that?
> Is this behavior avoidable at all?
It is a well documented fact that spammers abuse a setup like yours.
Yours is a bit unusual in that the low priority MX is the actual delivery
site not a fall-back server but spammers don't know nor care.
Spammers explicitly target low priority MXs because they believe
that those systems are fall-back servers and thus probably less well
'defended' against spam.
To stop your abuse, either remove univ.haifa.ac.il from the MX list for
"univ.haifa.ac.il" or configure the network fire-wall on univ.haifa.ac.il
so that it only accepts SMTP traffic from mr2.haifa.ac.il and
mr3.haifa.ac.il
--
Dave Funk University of Iowa
<dbfunk (at) engineering.uiowa.edu> College of Engineering
319/335-5751 FAX: 319/384-0549 1256 Seamans Center
Sys_admin/Postmaster/cell_admin Iowa City, IA 52242-1527
#include <std_disclaimer.h>
Better is not better, 'standard' is better. B{
