Looking to export mails from Thunderbird and verify that the emails are readable from the console:
nicholas@mordor:~/Downloads$
nicholas@mordor:~/Downloads$ mail -f linux.mbox
Cannot create mailbox linux.mbox: Requested item not found
nicholas@mordor:~/Downloads$
nicholas@mordor:~/Downloads$ head linux.mbox
From boris.gjenero@gmail.com Sun, 08 Oct 2023 04:18:08
Delivered-To: saunders.nicholas@gmail.com
Received: by 2002:a05:7208:81cd:b0:74:9338:9721 with SMTP id l13csp1184940rbf;
Sat, 7 Oct 2023 21:18:15 -0700 (PDT)
X-Received: by 2002:a05:6870:5386:b0:1d7:b3b4:4b8d with SMTP id h6-20020a056870538600b001d7b3b44b8dmr4448288oan.0.1696738695055;
Sat, 07 Oct 2023 21:18:15 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1696738695; cv=none;
d=google.com; s=arc-20160816;
b=mM9qT5ZWLbKeuGpRGsMnV8phEqDH2EAu82fPqpCIKm+dstFXHfTesv7yiAL1PKchHt
ctGMOVXc99GhL9Eh71jLGEk2BCVrwBtiQGYyPW5yZVC9WxvprQDJ9gpNED4L/pZtvshQ
nicholas@mordor:~/Downloads$
nicholas@mordor:~/Downloads$ tail linux.mbox
quot;Android-x86" group.<br />
To unsubscribe from this group and stop receiving emails from it, send an e=
mail to <a href=3D"mailto:android-x86+unsubscribe@googlegroups.com">android=
-x86+unsubscribe@googlegroups.com</a>.<br />
To view this discussion on the web visit <a href=3D"https://groups.google.c=
om/d/msgid/android-x86/314ca2d0-f910-4cde-9deb-449ab3aa3df5%40gmail.com?utm=
_medium=3Demail&utm_source=3Dfooter">https://groups.google.com/d/msgid/andr=
oid-x86/314ca2d0-f910-4cde-9deb-449ab3aa3df5%40gmail.com</a>.<br />
--------------NtsjPZDcs2AOcGZwtJdN5gK3--
nicholas@mordor:~/Downloads$
nicholas@mordor:~/Downloads$ wc -l linux.mbox
2425 linux.mbox
nicholas@mordor:~/Downloads$
However, not seemingly able to open the files with the mail command.
I'm selecting the option to download as mbox.
How is it confirmed that the messages are downloaded as mbox which can be opened by mailutils?
This is over IMAP with Gmail.
