Trung Pham wrote:
SPF records alone cut way down on the backspam I was getting. I was up
to about 80 bounce messages a day that had my domain as a return, but
were not sent by anyone here.
Isn't that the work of SRS and not SPF?
Not at all. This bounces are produced mostly by open-relays (often these
are cracked or misconfigured SMTP servers), which have no knowledge
about SPF. Spammer relays from a SMTP of such king a message with "MAIL
FROM:" set to an address in your domain. Open relay then tries to
deliver a message to a server that is well-configured and knows about
SPF. That server "sees" that the origin address was forged and refuses
to accept a message. As a result, open-relay sends a bounce to you
informing that it was unable to deliver a message, just because it
"thinks" that it was you (not spammer) who sent original message.
--
Best regards,
Alexey Loukianov mailto:[EMAIL PROTECTED]
System Engineer,
IT Department,
Lavtech Corp.
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