7z is the (default?) Compression format from "7zip". At least that's where
I see it.

I wouldn't be surprised if your carrier compresses the audio before sending.

This is all just my knee jerk assumptions.

Thanks,
Alex.

Sent from my Samsung Galaxy S8+

On Oct 18, 2017 20:01, <joe@actionline.com> wrote:

> Recently, I've begun to receive email messages like the one
> shown below with a "nnn.7z" attachment. Anybody have any
> idea what these are or how to read them?
>
> Message from 02028877960
> From: Voice Message Server <server@9138317697.tlnf.com>
> Date: Wed, October 18, 2017 at 7:30 pm
> To: (one of my email addresses)
>
> 19/10/2017, 08:15:35 PM
> 65,{rndnum(1,1)}}-second message deposited by 02028877960
> Voice Message(02028877960.7z
>
>
>
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