[MM3-users] Re: Generic Cannot connect to SMTP server error, no outgoing smtp connections

Stefan Bauer via Mailman-users wrote:

Mailman logs Cannot connect to SMTP server, however the server is listening, but i see no connection attempts. [...] If i restart the docker-core container, i see a single time the error "Cannot connect to SMTP server 172.17.0.1 on port 587".

Is it possibly to connect e.g. via telnet (from the host/IP mailman is running on, as the user mailman is running as) to the SMTP server? That looks more like a connection problem from A to B than a mailman problem.

-thh