How To Read Standard Email Bounces

This is what a standard email bounce will generally look like.
You can usually ignore the vast majority of the information provided.
I will highlight the important bits with a red box for you.

This is the area that you need to look at to find the necessary information.
You can generally ignore everything else in the message.

This will be the email address that rejected the message. Always.

This is the reason that the message was rejected,
and is almost always pretty direct in the reason why.
As you can see this particular bounce is due to the recipients mailbox being full.