Thousands of ssh probes

Randal L. Schwartz merlyn at
Sat Mar 6 16:26:58 UTC 2010

>>>>> "Matthew" == Matthew Seaman <m.seaman at> writes:

Matthew> On the whole, I don't see the value in having a high-numbered MX to
Matthew> dumbly accept, queue and forward messages like this.

High-numbered MX came from a time where an internal machine could
only be delivered from outside via an external gateway.  If you want
to deliver to, you tried its lowest MX first,
and failing to connect, you fall back to the next MX,
The idea is that would then be able to see
the next hop, and forward the mail.

The modern recommendation is to avoid MX altogether, and rely on split-horizon
DNS and SMTP delivery reattempts.  But a lot of people are still stuck in the
old ways.

Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn at> <URL:>
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