Google and Yahoo!, in an effort to reduce spam and phishing, both recently announced tighter security requirements for emails sent to the gmail.com and yahoo.com email domains. The major consequence of this is that anyone who manages an email service no longer has any excuses to not implement long-accepted best practices regarding email security.  Those best practices are now effectively mandatory if you wish for email emitted from your domain to reach the bulk of recipients. And it isn’t just email admins who have to worry about this. Anyone who is a customer of bulk-email services such as Constant Contact or Emma (or any other 3rd party service that might need to send email that seems to come from your domain) also has to deal with this.

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