en.wikipedia.org/wiki/DomainKeys_Identified_Mail
DomainKeys Identified Mail (DKIM) is an email validation system designed to detect email spoofing by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain is authorized by that domain's administrators and th ...
support.postmarkapp.com/customer/portal/articles/64736-how-c...
If you are having trouble verifying your SPF or DKIM records there are two useful tools you can use. Keep in mind that DNS make take several hours to propagate.
www.rackaid.com/blog/email-dns-records/
Bad DNS settings can undermine your email marketing campaigns. Fix up your DNS records and improve email open rates with these DNS tips.
protodave.com/security/checking-your-dkim-dns-record/
Due to the recently released vulnerability related to the use of weak cryptographic DKIM keys, I wrote a tool to check DKIM records and determine their public key length: DKIM Key Checker
www.mydigitallife.info/how-to-check-test-and-validate-spf-re...
SPF record in the domain DNS tree level is the new tool to combat email spam that trying to forge or spoof sender SMTP MAIL FROM and Return-Path from your domain zone. However, incorrect or misconfiguration of SPF definitions may lead to email been dis ...
www.activecampaign.com/spf/
Sender Policy Framework (SPF) is a method for preventing sender address forgery. As a result domains require an SPF record for their mail systems if they want their emails to be accepted by those providers.
mandrill.zendesk.com/hc/en-us/articles/205582267-What-are-SP...
support.google.com/a/answer/2466563?hl=en
Once SPF and DKIM are in place, you configure DMARC by adding policies to your domain's DNS records in the form of TXT records (just like with SPF or ADSP).
dkimcore.org
DKIM Core is a way to attach a token (or tokens) to an email that tells the recipient who is responsible for the email (typically the token would represent the author of the email, the operator of the email service, or the owner of a mailing list, but ...
www.spfwizard.net/what-is-spf-record.html
An article on what Sender Policy Framework (SPF) is.
dmarcian.com/dmarc-what/
This is a simple article explaining what DMARC is for and how it works.
www.arclab.com/en/kb/email/how-to-read-and-analyze-the-email...
This article describes how to read and analyze the email header fields and provides information about SPF, DKIM, SpamAssassin
en.wikipedia.org/wiki/Sender_Policy_Framework
Sender Policy Framework (SPF) is a simple email-validation system designed to detect email spoofing by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain comes from a host authorized by that domain's admi ...
www.hostingfixes.com/email/what-are-spf-records
SPF records (Sender Policy Framework) are DNS entries that you add to your domain name. They will specify which IP numbers are allowed to send emails from your domain name. If email is spoofed from another location (such as saying that it’s comin ...
msdn.microsoft.com/en-us/library/cc188656%28v=exchsrvcs.149%...
You use SPF records to ensure that destination e-mail systems trust messages sent from your domain. The SPF record is important because it ensures that all the messages from your domain appear to originate from the messaging servers that support the cl ...
www.digitalsanctuary.com/tech-blog/debian/setting-up-spf-sen...
A Guide to Setting Up SPF, SenderId, Domain Keys, and DKIM as spam prevention measures
support.sendgrid.com/hc/en-us/articles/200185168-SPF-Don-t-E...
Many people may not realize it, but the Sender Policy Framework (SPF) specification has a limit on the number of DNS lookups (10) required to fully resolve an SPF record. One typically quickly exceeds this limit through the reckless use of the include ...
yoast.com/dev-blog/email-reliability/
When you send email from your web server, email reliability is very important. Setting up your SPF record correctly helps tremendously!
www.port25.com/support/dmarc/
Phishing attacks continue to be one of the top Internet security threats, costing companies and individuals billions of dollars every year. Over 100 million phishing messages get through spam filters everyday costing brands and estimated 70.2 bil ...
www.port25.com/support/authentication-center/dkim/
Recently the IETF DKIM Working Group concluded discussion pertaining to Email Authentication. For Email Authentication this was a major win as DKIM shows much promise to help ISPs better understand wher ...
