On Sun, Dec 6, 2020 at 7:20 AM Hans-Martin Mosner via mailop < mailop@mailop.org> wrote:
> In addition, manual checks against spam mails from hosts on > spam-supporting or indifferent network IP ranges shows that > spammers provide SPF records for their domains, of course, so properly > applied SPF is bound to have a significant > percentage of false negatives. > I wouldn't call these false negatives, because the objective of SPF is not to prevent spam entirely but simply to authenticate that the sending host is authorized to send for the given domain. In that regard, it's working and you're not seeing false negatives. You're simply receiving spam from spammers using actual spam domains over which they have control or domains without proper SPF configurations. SPF is helping prevent spammers from sending email from your domain and my domain and other folks' domains, however, when you and other mail server operators configure things correctly. Matt Harris|Infrastructure Lead Engineer 816-256-5446|Direct Looking for something? Helpdesk Portal|Email Support|Billing Portal We build and deliver end-to-end IT solutions.
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