There are many possible reasons for having to
file by mail rather than e-filing.
Since you mention that you are recently
divorced, one very common possibility is that you and your former spouse are
both trying to claim the same person(s) as dependents. The IRS will reject a
return filed with a dependent SSN of a person who has already been claimed on
another filed return.
Another very real possibility this early in the
year is that you are attempting to file a return containing one or more forms
that have not yet been “finalized” by the IRS. If this is the case, you should
wait until the form becomes “available” before trying to e-file your return.
For more information about avoiding e-file
rejections, please see Tax
Tips for Avoiding E-file Rejections.