mail not working

I have an empty mail folders except those on Mac which have some emails. Can't send when I try I get:

This message could not be sent. It will remain in your Outbox until it can be sent. This message could not be sent because your account does not have a preferred outgoing mail server. Select an outgoing mail server from the list below.

There is no list. Advice appreciated.

Has invited:

howapple - hello

Favor from:

If similar problems occur in the future

Mail > Window > Connection Doctor

... should be used. It checks Incoming and Outgoing Servers separately, and allows you to click on any red lights and get immediately to the separate settings for incoming or outgoing server.

Mail cannot tell the difference between "server not responding" for a multitude of reasons, and may occasionally ask you to re-enter your password because it could not make a connection. Unless you know there are password problems, you should dismiss those dialogs (without entering anything) and just try again later.

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