Sendinblue configuration

I have protected my domain with let’s encrypt, all work fine but I have to configure a subdomaine for sending mail with sendinblue.

Currently, I can’t access my newsletter cause I have a security error :

My subdomain is and when I try to generate a certif I get this error :
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for
Using the webroot path /var/opt for all unmatched domains.
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. (http-01): urn:acme:error:unauthorized :: The client lacks sufficient
authorization :: Invalid response from "
<html "

 - The following errors were reported by the server:

   Type:   unauthorized
   Detail: Invalid response from
   "<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   <html "

   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A/AAAA record(s) for that domain
   contain(s) the right IP address.

Uses CloudFlare:

I’ve solutioned this probleme by removing the property includeSubDomains so I can let without ssl so it can be used with sendinblue.

For your information, sendinblue sales this fonctionnality 108€ / year …


You should be thanking LE and maybe send them a donation too.

It doesn’t feel very likely to be that your webroot is really /var/opt. That would mean that if you created /var/opt/test.html, it would show up at Is that really the case?

If not, you should use -w to specify the correct location where files are placed on your server in order to appear on the web site.

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