Roundcube - SMTP Error (): Connection to server failed

Roundcube Webmail 1.6.11
Yunohost 12.0.17

Roundcube was working ok, but not now. Now users cannot send email, they get:
SMTP Error (): Connection to server failed

Sending emails keeps working ok if managed through regular clients.

I reinstalled Roundcube to see if that fixed it, it did not.

What should I do?
Is there any logs I should check? Cannot find them.

Thank you

This topic was automatically closed 15 days after the last reply. New replies are no longer allowed.