# 550 Verification Failed ´No Such User' (Callback verification)

**URL:** <https://meta.discourse.org/t/550-verification-failed-no-such-user-callback-verification/95560>\
**Category:** Self-hosting\
**Created:** [August 24, 2018, 10:05am UTC](https://meta.discourse.org/t/550-verification-failed-no-such-user-callback-verification/95560 "2018-08-24T10:05:51Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![dexpositoromero](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/dexpositoromero/32/119643_2.png) [@dexpositoromero](https://meta.discourse.org/u/dexpositoromero)\
**Post date:** [August 24, 2018, 10:23am UTC](https://meta.discourse.org/t/550-verification-failed-no-such-user-callback-verification/95560/3 "2018-08-24T10:23:17Z")

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Right… So it looks like it is fixed now…  
Just for future reference from someone having this problem, I just went to **cPanel \> Email Routing** , and for the subdomain I am using for Discourse (and thus the subdomain Mailgun generates the postmaster/no-reply emails) I chose _“Remote Mail Exchanger”_ and click on _“Change”_…  
Seems to work now with all emails… 🙄

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_[View the full topic](https://meta.discourse.org/t/550-verification-failed-no-such-user-callback-verification/95560)._