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Why are some people’s email addresses changed to be “via Groups.io”?

Some email addresses are changed to be “via Groups.io” because of the DMARC email authentication policy. Certain email services, such as Yahoo Mail and AOL, have set up their DMARC profiles so that Groups.io has to change all their users' email addresses to the “via Groups.io” form; otherwise, their group messages would bounce.

Note: This situation is not limited to Groups.io. All email group services have to deal with it.

Updated: September 21, 2026

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2FA account settings analytics Android app app cover photo credit card on file dark mode downgrading Emailed Photos album extra member data Groups.io mail servers guidelines iOS app IP addresses items per page keyboard shortcuts logging in member labels mobile app moderation settings past members payers privacy settings private groups public groups sessions signatures Slack synchronization social logins spam control settings spam reported message summaries Tapbacks threading two-factor authentication upgrading username videos visibility web/app notifications Terms