Success with Sending email without a SMTP Server!!!!
kee at kagi.com
Mon Jan 31 02:13:24 CST 2005
On Jan 30, 2005, at 10:19 PM, Richard Gaskin wrote:
> But doesn't this mean that all any spammer has to do is use the same
> trick to send spam to a recipient on the recipient's own SMTP server?
This is exactly what spammers do.
The only reason a spammer would use a relay (someone else's SMTP mail
server) is that the mail server will immediately accept the email and
then try to deliver it for many days. The typical spammer going direct
to your server will only try once and then move on.
The other thing a spammer will do is to disguise the mail headers so as
to disguise the machine they are sending from. But, fortunately, the
SMTP spec requires the receiving mail server to add information about
So another way to disguise is to use a proxy relay. The proxy just
mimics the commands given by the spammer so that for all practical
purposes, the spammer is driving the proxy. It that way, the SMTP
server does not see the IP address used by the spammer and instead sees
just the proxy IP address.
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