On Wed, 5 Mar 2003, Chris Lewis wrote:
David F. Skoll wrote:
On Wed, 5 Mar 2003, Vernon Schryver wrote:
I disagree, because many spammers work hard to remove bad addresses
from their target lists. Other spammers don't, but still others work
hard to honor "unsubscribes" or "removes."
In order to remove bad addresses (as Justin Mason pointed out), or honor
unsubscribes, spammers would need to supply either a valid return address
or a Web page somewhere that's trackable.
Sorry, wrong. All bad address removal requires is spamware that
understands SMTP error codes. No reverse channel of any kind required.
Not all mail goes direct to a server that can issue a 5xx if its an
invalid user. If it goes through a service like MessageLabs' it gets
through the first connection just fine. You may get a bounce from us
though at delivery time.
Matt.
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