# Migrating users with invalid emails

**URL:** <https://meta.discourse.org/t/migrating-users-with-invalid-emails/61302>\
**Category:** Product Support\
**Created:** [April 20, 2017, 5:49am UTC](https://meta.discourse.org/t/migrating-users-with-invalid-emails/61302 "2017-04-20T05:49:33Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![JagWaugh](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jagwaugh/32/69335_2.png) [@JagWaugh](https://meta.discourse.org/u/JagWaugh)\
**Post date:** [April 20, 2017, 6:28am UTC](https://meta.discourse.org/t/migrating-users-with-invalid-emails/61302/3 "2017-04-20T06:28:48Z")

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> [@codinghorror](#):
>
> If they get marked active, it will be bad, because Discourse will try to mail them.

If you have a lot of them, then it won’t just be bad… it will be **very** bad. It doesn’t take many mails to nonexistent users before that provider blacklists you, meaning that your users with existent mailboxes at that provider don’t get any discourse emails either.

Get this right before you go live, it’s important.

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_[View the full topic](https://meta.discourse.org/t/migrating-users-with-invalid-emails/61302)._