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SMTP Flags SPF, DKIM, DMARC
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| ################################################ Automatic Checks | |
| $ https://mxtoolbox.com/SuperTool.aspx | |
| ################################################ SPF Dig Lookup | |
| $ dig domain.com txt | |
| ################################################ DMARC Dig Lookup | |
| $ dig _dmarc.example.org txt | |
| ################################################ DKIM Dig Lookup - selector must be known - found in email header - DKIM-Signature | |
| $ dig google._domainkey.example.org | |
| DKIM-Signature: v=1; a=rsa-sha256; d=example.com; s=news; | |
| c=relaxed/relaxed; q=dns/txt; t=1126524832; x=1149015927; | |
| h=from:to:subject:date:keywords:keywords; | |
| bh=MHIzKDU2Nzf3MDEyNzR1Njc5OTAyMjM0MUY3ODlqBLP=; | |
| b=hyjCnOfAKDdLZdKIc9G1q7LoDWlEniSbzc+yuU2zGrtruF00ldcF | |
| VoG4WTHNiYwG | |
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