# Prevent duplicates in allowed email list

**URL:** <https://community.glideapps.com/t/prevent-duplicates-in-allowed-email-list/18724>\
**Category:** Ask for Help\
**Created:** [November 21, 2020, 7:43am UTC](https://community.glideapps.com/t/prevent-duplicates-in-allowed-email-list/18724 "2020-11-21T07:43:35Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![ThinhDinh](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/thinhdinh/32/49_2.png) [@ThinhDinh](https://community.glideapps.com/u/ThinhDinh)\
**Post date:** [November 22, 2020, 1:27pm UTC](https://community.glideapps.com/t/prevent-duplicates-in-allowed-email-list/18724/6 "2020-11-22T13:27:29Z")

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I would create a user specific column to store the input email, then make a relation of that input email to the existing email list. If relation is empty then record, if not then show fail notification.

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_[View the full topic](https://community.glideapps.com/t/prevent-duplicates-in-allowed-email-list/18724)._