greybeard
Herd Master
For the past few years we have tried to e-file. But each time we did that, we'd get an email stating that it was "rejected" and asked that we check our info (DOB, SSN) to make sure it's correct. I checked all of that nothing was incorrect. So I just mail them.
There is a possibility, that someone else has 'borrowed' your SSN or other identifying data at one time or you made an error on one of your previous paper filings and IRS people eyes didn't catch that. Could be something as simple as a misspelled name, incorrect address, misspelled address, different ph # or anything else that a modern computer's query finds right away. One wrong letter or digit and the cross check software kicks it out...rejects it.