Hardware: VPS bought online (vultr.com), debian 9.
YunoHost version: 184.108.40.206 (stable).
I have access to my server : Through SSH & through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no
Description of my issue
Apps are unable to send email.
I installed both Mattermost and Wordpress in my freshly installed YNH.
Neither of them are able to send out emails.
For mattermost these should be invitation emails for new users.
In Wordpress I also made a new user and invited asked WP to send the login details to the new user