Email Authentication and Generation - sgml/signature GitHub Wiki
- https://tools.ietf.org/html/rfc4180
- https://www.ietf.org/rfc/rfc3676.txt
- https://tools.ietf.org/html/rfc2822
- https://tools.ietf.org/html/rfc2646
- https://www.logintc.com/blog/2014-01-14-one-time-passwords.html
- https://www.sans.org/reading-room/whitepapers/authentication/two-factor-authentication-2fa-openotp-36087
- https://securityintelligence.com/whats-wrong-with-sms-authentication-two-ibm-experts-weigh-in-on-the-nist-recommendation/
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- https://sendgrid.com/docs/ui/sending-email/formatting-html/
- https://mathiasbynens.be/notes/gmail-plain-text
- https://discussions.apple.com/thread/2235362
- https://stackoverflow.com/questions/22765834/insert-a-line-break-in-mailto-body
- https://support.google.com/mail/thread/22778647?hl=en
- https://www.esecurityplanet.com/compliance/getting-dmarc-right/
- https://usa.kaspersky.com/blog/how-to-cure-dmarc/23047/
- https://dmarcian.com/life-after-reject/
- https://help.yahoo.com/kb/new-mail-for-desktop/pop-access-settings-instructions-yahoo-mail-sln4724.html
- https://www.internet.nl/
- https://seanthegeek.net/459/demystifying-dmarc/
- http://dkim.org/deploy/
- https://www.cisco.com/c/dam/en/us/products/collateral/security/esa-spf-dkim-dmarc.pdf
- https://blogs.msdn.microsoft.com/crm/2018/11/05/dynamics-365-for-marketing-set-up-dkim-for-your-sending-domain-to-keep-up-with-recent-office-365-changes/
- https://support.google.com/domains/answer/3251241?hl=en
- https://empathysites.com/keep-email-and-web-hosting-separate/
- https://www.sparkpost.com/blog/forwarding-inbound-email-with-heroku/
- https://www.iplocation.net/email-delivery-problems