The IRS does not do email. Period. If you get an email, it is a phishing scam. That is the good news. The bad news is the IRS does not do email. Everything is snail mail. For me, I have a mail forwarding service. I pay all bills online, so sometimes I don't get mail for 3+ months.
The other thing I learned, is you are not dealing with the IRS. You are dealing with somebody that works for the IRS. They have different agendas, and different levels of knowledge and experience.
The worst I heard, the guy was a di@k. They had to go to a meeting with their accountant with the the IRS. My first, the guy was friendly, scary knowledgeable (pilot stuff), and professional. Handled with a couple of mailings and phone calls. My current one is the second worst I have heard of. I am dealing with the village idiot at the wrong division of the IRS (ss-8). She dragged it out so long, I had to petition for the tax court. Now I am dealing with the IRS's lawyer, on her first case, I believe. The sister of the village idiot. I will win, even if I have to go to tax court. But it is still a pain in the a$$.
And I did everything correct, and above board. I owe nothing, legally.