[Asrg] Re: Re: draft-duan-smtp-receiver-driven-00.txt

[Tony Finch <dot at dotat.at>]

> You missed one more piece of information in the notification: a
> limited subject header summarizing the contents.

A wonderful place to put a spam message and URL.

> 1) Your regular contacts will typically be in the allowed class. If
> you see a notification from your regular contact that is in the
> unclassified folder, it is easy to tell it is a faked message and you
> need not spend time on it.

This statement is not generally true. For example, the IP addresses of the
sending site's MTAs may have changed, or the sender may be roaming.

> 2) For the other legitimate senders that are not in your allowed
> class, how often you hear from them?

These kinds of messages are frequently extremely valuable.

> It is possible that instead of relying on RMTA to record the SMTA IP
> address, we can do a DNS MX lookup of sender email address to get the
> MTA IP address at the sender side. However, this indeed means that if
> sender side uses different MTA servers for incoming and outgoing
> messages, they need to be in sync about state of outgoing message queue
> (for example, shared file systems).

Gee, that's a good idea. Imagine a shared filesystem supporting the whole
email infrastructure for millions of customers!

Tony.
-- 
f.a.n.finch  <dot at dotat.at>  http://dotat.at/
BISCAY: WEST 5 OR 6 BECOMING VARIABLE 3 OR 4. SHOWERS AT FIRST. MODERATE OR
GOOD.

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