I haven't checked with support if I did something wrong.  Yes I will send it UPS to get tracking as well as a signature and I print out all rejections.  I mail the extension, should I then mail the 2553 in giving IRS time to record both.  I will have a few months on the actual return.  By the way, their are 2553's I've sent in during Corvid that I haven't hear anything on.  The return processed with a problem. Grammy