# SSO with non-unique email addresses?

**URL:** <https://meta.discourse.org/t/sso-with-non-unique-email-addresses/68125>\
**Category:** Product Support\
**Created:** [August 16, 2017, 1:14am UTC](https://meta.discourse.org/t/sso-with-non-unique-email-addresses/68125 "2017-08-16T01:14:30Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![codinghorror](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/codinghorror/32/110067_2.png) [@codinghorror](https://meta.discourse.org/u/codinghorror)\
**Post date:** [August 16, 2017, 1:19am UTC](https://meta.discourse.org/t/sso-with-non-unique-email-addresses/68125/2 "2017-08-16T01:19:27Z")

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No, emails are unique identifiers for users in Discourse and this is fundamental to all identity in the system.

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_[View the full topic](https://meta.discourse.org/t/sso-with-non-unique-email-addresses/68125)._