I must have missed the update in ProSeries on e-filing 7004 with a stamp.
I think I'd go with Certified RR. Heard of too many IRS assessments because they 'claim' to receive a paper filing whenever someone gets around to posting it. Friend of mine, (not a client) just got a pretty serious bill because IRS said they didn't receive 2019 1120S paper filing for 6 months after he signed (and mailed) it.
@taxiowa good to see you're not driving for Uber.
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