# Bulk email without duplicates

**URL:** https://meta.discourse.org/t/bulk-email-without-duplicates/377604
**Category:** Support
**Created:** [August 6, 2025, 7:31pm UTC](https://meta.discourse.org/t/bulk-email-without-duplicates/377604 "2025-08-06T19:31:16Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![jahan\_gagan](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jahan_gagan/32/501948_2.png) [@jahan\_gagan](https://meta.discourse.org/u/jahan_gagan)
#### Post date: [August 7, 2025, 9:44am UTC](https://meta.discourse.org/t/bulk-email-without-duplicates/377604/2 "2025-08-07T09:44:38Z")

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If you require guaranteed duplicate-free delivery across arbitrary sets of groups and categories, you must:

- Export user lists from the targeted groups or categories.
- Merge and deduplicate these lists, either manually or using a script.
- Use an external email processor to send the message to the deduplicated list.

This is the most robust way to ensure that users don’t receive the same announcement multiple times.

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_[View the full topic](https://meta.discourse.org/t/bulk-email-without-duplicates/377604)._