Setting Up Email with Sendmail

I’m trying to set up email using sendmail with this guide.

However when I try to configure it, my host name is not qualified:

WARNING: local host name (ToSO) is not qualified; see cf/README: WHO AM I?

I’ve tried editing the host file but it still doesn’t change my host name. Could someone point me in the right direction please?

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I cannot for the life of me understand why do people feel the need to come back and say “Nevermind” on a question other people may find useful.

You never said how you did it?

Never mind I got it to work.