From: william(_at_)elan(_dot_)net
Subject: [Asrg] Notes on Callback SMTP Transmission
As promised I'm sending you notes on callback tranmission. This notes
are similar format as verification notes I sent before and in fact I had
them done together.
Callback transmission is an interesting idea, but consider:
1 - NastySpammer sends millions of connections from thousands of 0wned hosts,
and suddenly poor victim gets a DDoS from all the callbacks from hosts
attempting to receive the purported mail.
2 - How does this fix open SMTP relays? An open SMTP relay will presumably
set itself as the host to call back. In fact, how does this interoperate
with SMTP relaying?
--
David.
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