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Security and Sharing
Now that Salesforce requires domain-level and user-level verification to send email from a site, enable people who use public email services to send messages from the site.
- Enable All Site Users to Send Email
Salesforce now requires both domain-level and user-level verification to send email. Enable users whose email domains you can't verify to send email from your sites. For example, enable people who use public email services such as yahoo.com or icloud.com to send messages from a site.

