Please be very careful if you receive a phone call from someone who identified them self as an IRS agent.
I was recently contacted by a taxpayer who had just gotten such a call. The caller identified himself as an IRS agent and gave what he said was his ID number. The caller then asked for the taxpayer's bank information so that he could direct deposit a $2500 refund into the account. The taxpayer gave his bank info since he is expecting a refund. It was not until after he got off the phone that the taxpayer got nervous and called his bank. Luckily, they suggested closing that account (he did) and he will not lose any money.
If you get a call from someone saying they have a tax refund for you, please be careful. Get their name and ID number. The number is generally a 7 digit number but it could also be 10 numbers. They will also be glad to give you a phone number to call in and check on what they are asking for. If you are concerned, tell them to mail your refund.
At this time, the IRS is not using e-mails for business purposes. So if you get an e-mail, please ignore it.