# Let's Encrypt X3 nightmare

**URL:** <https://meta.discourse.org/t/lets-encrypt-x3-nightmare/204918>\
**Category:** Product Support\
**Created:** [September 30, 2021, 10:51pm UTC](https://meta.discourse.org/t/lets-encrypt-x3-nightmare/204918 "2021-09-30T22:51:56Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![wlandgraf](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/wlandgraf/32/154660_2.png) [@wlandgraf](https://meta.discourse.org/u/wlandgraf)\
**Post date:** [September 30, 2021, 10:51pm UTC](https://meta.discourse.org/t/lets-encrypt-x3-nightmare/204918/1 "2021-09-30T22:51:57Z")

</div>

I’m getting the following error when using the mail-receiver app as of today. It was working fine before.

It’s trying to send the e-mail to Discourse via API. Is it possible it’s caused by [DST Root CA X3](https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/) certificate expiration?

If yes, anyone has any idea about how to solve it? I tried to rebuild both app and mail-receiver, recreating Let’s Encrypt certificates, etc..

> \<19\>Sep 30 22:07:26 receive-mail[96]: Failed to POST the e-mail to [https://forum.validadortiss.com.br/admin/email/handle\_mail:](https://forum.validadortiss.com.br/admin/email/handle_mail:) SSL\_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (OpenSSL::SSL::SSLError)

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_[View the full topic](https://meta.discourse.org/t/lets-encrypt-x3-nightmare/204918)._