It depends.
Yes, they do send notices if they are requesting additional information. It should have a notice (CP) or letter (LTR) number on the top or bottom right hand of your letter.
Please see the following link to confirm that your notice is legitimate and from the IRS.
IRS notices
Please note, the IRS does not initiate any contact using email, text message, or social media channels. This would indicate a scam. Please see the following link if you received your notice in one of these methods.
IRS Phishing scams
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