Received recorded message from 'Julie Smith' of IRS warning of dire (but unspecified) tax consequences if I did not take the call seriously and contact her immediately.

There is a fairly common IRS or "tax scam" being practiced by scammers on both Canadian and USA residents.
USA tax payers should read this:
http://www.irs.gov/uac/Newsroom/IRS-Reiterate ... -Telephone-Scam

Short answer:
The IRS never initiates a contact via phone.
They always send a snailmail first.

Educational post:
This scam is also described as scam #11, here:
http://phonehelp.2truth.com/facts_rev.html

Remember to return here, to 800notes.com, after you look at any of the information at that site, either to post more information, or to let us know you avoided the scam, or to read any further information about that number that others may post.

This is totally a scam. One of our retired tax clients just called to confirm with me that this was a scam.  Beware, do not call them back! It was the same exact message from 'Julie Smith' of IRS warning of dire (but unspecified) tax consequences. This had our client alarmed, just not fair! Shame on you scammers, I'm sure you are reading this!

Thank you ! they just called me too , and I agree shame on them!!!

i got the same call today, when I was on to them I called back they yelled and cussed me out. Report them at www.tigta.gov