Yeah, mail it.  I played that game last year.  I do mom's and new dad's return and another preparer does old dad's return.  Daughter finishes up college and goes to work during the year.  Daughter's return bounces.  Dad says "I haven't claimed her in years".  However dad evidently never looked at his return and preparer keeps claiming daughter.  Other preparer files amended return for dad and I wait.  And I wait. And I wait some more.  And then I wait some more more.  Finally after attempting to submit the return unsuccessfully, I finally wave the white flag and paper file the return.  I would never do that again.  Go with less stress - go with paper.