why do people sometimes reply an email with a new message and sometimes to an old email address?

I find it VERY VERY annoying when someone replies my email with a completely new message!!

What exactly is the point of going out of the email to hit "new" and only to say, "thanks" or something???

Or, when they reply with a new message to my old email address that I hardly use anymore for the past 2 years. They know from previous correspondence not to write there and they still do. WITH A REPLY (via "NEW")...stupid!!

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