Secure Email

• http://www.techrepublic.com/blog/google-in-the-enterprise/send-better-email-configure-spf-and-dkim-for-google-apps

SPF

• http://en.wikipedia.org/wiki/Sender_Policy_Framework
• https://support.google.com/a/answer/178723
• Gmail v=spf1 include:_spf.google.com ~all
• Checker - http://spf.myisp.ch

DKIM

• http://en.wikipedia.org/wiki/DomainKeys_Identified_Mail

DMARC

• https://support.google.com/a/answer/2466563?hl=en
• _dmarc 1800 TXT v=DMARC1; p=none; rua=mailto:admin@inetdata.cz

Verify that SPF and DKIM are configured

• Send an email to check-auth@verifier.port25.com
• http://www.port25.com/support/authentication-center/email-verification
• http://www.openspf.org/Tools

Bulk Senders Guidelines

• https://support.google.com/mail/answer/81126

Tools

• https://toolbox.googleapps.com/apps/checkmx/check
• https://gmail.com/postmaster/
• https://www.mail-tester.com/spf-dkim-check
• https://starttls.info

Webmail with end-to-end encryption

• https://www.mailvelope.com