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I read that the $MAIL shell environment variable is one of the most common ones, and stores the location of my mailbox file, where my emails are stored.

I looked into the /var/spool/mail and /var/mail directories, and there are no files or directories in them at all (checked with cd /var/spool/mail; ls as well as checking Show Hidden Files under the View menu.

Yet I have Thunderbird Mail running and do have mail coming in from my GMail.

So my (related) question is two-fold - Where are my emails kept? And why is my $MAIL environment variable not defined?

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The $MAIL variable points to the location of your system mail account (i.e. where Postfix, Exim, ... would drop your mails when using the sendmail or mail to send a mail to a local user), however this variable is not used by any graphical E-Mail client I know of -- Which is probably why is its not defined.

Thunderbird stores your E-Mail in these directories:

  • ~/.thunderbird/<ProfileName>/Mail for local messages (sent messages and messages obtained via POP3)
  • ~/.thunderbird/<ProfileName>/ImapMail for downloaded IMAP messages

Note: <ProfileName> is the name of your user Thunderbird user profile and will look similar to this: e7d2hvg8.default.

  • So if I download and install Postfix (which I actually don't know how to at the moment, actually), I will have the $MAIL variable set automatically? A bit of topic, but I also don't have the PROMPT_COMMAND environment variable. – dayuloli Jun 1 '14 at 3:29
  • I'm not sure but it seems like the $MAIL variable is set for all new user logins after the /var/mail directory has been created, however Postfix might also be involved somehow... Anyway installing software is done through apt-get or aptitude on command line (i.e.: sudo aptitude install postfix), there is also the Software Center for higher level and Synaptic for lower level package management if you prefer GUIs. OT: What's your background? REHL? SLES? BSD? Mac? – ntninja Jun 1 '14 at 13:03
  • Also $PROMPT_COMMAND can be set in ~/.bashrc – ntninja Jun 1 '14 at 13:04
  • Thanks for the help! I've used Windows all my life, never touched Unix or Linux til this week. I want to learn Linux because I think managing my own server would be really cool! And most servers run Linux. – dayuloli Jun 1 '14 at 13:08

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