Port 25 is almost universally blocked because of this. It’s also blocked on a lot of residential ISPs for the same reason. This is probably one of those things where the documentation could be improved. A quick Google of the docker container that is being used for postfix says that we should be able to use another SMTP relay through gmail or another provider as an example, although I have not tried yet.
Port 25 is almost universally blocked because of this. It’s also blocked on a lot of residential ISPs for the same reason. This is probably one of those things where the documentation could be improved. A quick Google of the docker container that is being used for postfix says that we should be able to use another SMTP relay through gmail or another provider as an example, although I have not tried yet.