A word in the ear of email providers

If you’re an email provider, try to reject unwanted mail during the SMTP exchange where possible. Once you accept a message for delivery, then decide that it shouldn’t be delivered, you are faced with the unenviable task of where to send the non-delivery report. You can’t rely on the validity of the “From:” and “Reply-to:” headers, and sometimes even the “Envelope Sender” or “Retrun path” details, because sender credentials are commonly forged in order to divert attention away from the real sender. A misdirected bounce only adds to the spam problem. Even the “Received:” headers can be tampered with.

The IP address of the system wanting to deliver email to your system is one of the more reliable pieces of information available to system admins – the internet relies on accurate IP addresses in order to work properly.  DNSBL technology is a well established method of quickly and efficiently learning about the reputation of a particular IP address. Both Spamcop and Spamhaus are well established providers of DNSBL services. Using one (or both) should help you stop spam in its tracks. Be sure to read their terms of use. Take the time to read AND understand what they do and how they work.

There are several websites available to help you do your research. The resources provided by WhatIsMyIpAddress and multirbl.valli.org can be of immense help.

Don’t be fooled by claims that you are obliged to pay for removal from one of the UCEPROTECT and Backscaterer lists. If you fix the problem that resulted in the listing, the removal will happen automatically. The payment is only required if you can’t wait a week (or more) after fixing the problem.

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Author: lisati

Married and not looking. No children, one cat, and other cats sometimes come to visit from time to time. Member of Ubuntu Forums since 2007.

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