Undeliverable <504> failure

C

collinsjacob

I can receive all of my email but when I go to send out a message I
immediately get back a message that says:

504 <JACOB>: Helo command rejected: need fully-qualified hostname

The subject of the message is Undeliverable: and then the subject of my
attempted email. HOW DO I SEND OUT MY EMAIL!

Can anybody help me?
 

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