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Various antispam programs treat an SPF mismatch differently. Most will not consider an email spam JUST because of that. Usually there is some sort of points based system under the hood. <br />
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So, a particular vender may have a scale of 0-10 of &quot;spammyness&quot;, divert anything scoring 5 or higher, and assign +3 for an SPF match, -3 for an SPF pass, and zero for no SPF record at all. Usually there are hundreds, if not thousands of things examined. An email with a mismatched SPF will still therefore get through if it has no other signs of spammyness. <br />
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Unfortunately, legitimate emails with SPF set up incorrectly are somewhat common.
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Various antispam programs treat an SPF mismatch differently. Most will not consider an email spam JUST because of that. Usually there is some sort of points based system under the hood.

So, a particular vender may have a scale of 0-10 of "spammyness", divert anything scoring 5 or higher, and assign +3 for an SPF match, -3 for an SPF pass, and zero for no SPF record at all. Usually there are hundreds, if not thousands of things examined. An email with a mismatched SPF will still therefore get through if it has no other signs of spammyness.

Unfortunately, legitimate emails with SPF set up incorrectly are somewhat common.

Dusan Stojanovic

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I want to know about email spoof.<br />
For example , I know that we can verify an email is spoofed or not by SPF.<br />
But using anonymousemail.me ,we can know it is spoofed mail, but it goes into inbox.<br />
Why it is not filter by spam-filter?<br />
Thank you.
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I want to know about email spoof.
For example , I know that we can verify an email is spoofed or not by SPF.
But using anonymousemail.me ,we can know it is spoofed mail, but it goes into inbox.
Why it is not filter by spam-filter?
Thank you.

email Spoofing

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.