Is their a way to have my linux box check an email account, look for a specific email from a specific sender and execute a command?

Your question does not match the title...

I sincerely hope not....

Send a standard command based on the content (or identity of the sender) of email? Sure.

Some ticketing systems do something like this.. of course it depends on the type of command you wish to execute.

for example. OTRS2 -

User sends email to helpdesk@mycompany.com

OTRS2 polls the email server and retrieves email that was sent to it.
OTRS then evaluates the message for certain criteria (from address, Subject keywords, etc.. ) and decides Which queue it belongs in, updates the database, possibly sends out a notification to the tech.

I believe OTRS is written mostly in perl.

Not sure what you are trying to accomplish, explaining a bit more about your goals might make it more clear.

Don't know if you are trying to write your own solution but http://search.cpan.org/~simon/Mail-Audit-2.1/Audit.pm might help.

Ok, maybe I should be more clear.

Say I send an email to xyz@email.com, the linux box would monitor this account, and say when it saw a message from me@email.com, and if the email had a specific line (ie: where are you), it would then reaply to that email with some info (my ip is: 123.123.123.123), or also run a command like reboot, halt...

Can this be done?

Is there some reason your post shouldn't be seen as an attempt to get information about hacking someone else's system?

I can think of several ways to do this but no turnkey solution.

Are you willing to write something yourself?

Otherwise, I got the impression that you have a dynamic IP and trying to find a way to reach your computer remotely. If this is the case then you could use a service like http://www.dyndns.com. They provide a free service that does just that.

Why does it sound like I want to hack in to some else's system? Emailing my box (note not someone elses) a command does not make it hack someone else. Besides, don;t you think that if I am asking this question here, its because I don't know how to do it, and if I could hack someone, I would probably know how to do this anyway?

I don't know much about writing in linux. If I had a working example, I might be able to reverse it and learn from it.

Any ideas?

Lol. The OP should look into MS Outlook.

I don't have any real turnkey solution in mind.

Along with the library I suggested earlier, fetchmail might also come in handy. But you will most likely have to spend some time learning your way around before putting together something functional.

Something like http://freshmeat.net/projects/mail2sh ?

How would you implement mail2sh to execute a command from an email?

you might be better off setting up a dyndns registration from www.dyndns.com to your computer and setting up webmin (www.webmin.com), then there are scripts that automatically update your dyndns information automatically, that way you can have a web interface at mycomp.homelinux.com and just launch a web browser to mycomp.homelinux.com:10000 and have nearly full control of your box
if you don't need a full web interface then a portable version of putty on a thumb drive and setting up ssh access and ssh using putty to mycomp.homelinux.com would work too

How far are you with the installation? Did you actually download the tarball and peruse the contents?

The idea of emailing was so I could send it from my mobile, and I know I can't SSH with my mobile.