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So i am a filer from TX. I have now faxed the requested forms (1095 a and complete 8962) . the issue i have now is the fear of the  fax not being received properly. I got a confirmation but that doesn't mean that this high volume location received it . The letter states that it does not send you fax confirmation but this leaves the filer in a vulnerable situation , especially if you consider that you have to respond to letter within "20" days  but your processing time of the sent in documents is 6-8 weeks(i read in TT forums that last year you could call in and confirm . i called twice today 2/26/20 and the reps said this is not possible ). some may say if you feel this way you should send certified letter. that option is not fail proof however. i actually had to pay irs a few years ago , so i sent money order certified mail .  months later i got a new tax bill with a couple of penalty's . i then had to set up an appointment with IRS to plead my case in which i had money order stub and certified mail delivery receipt. I won my case but that process put me through unexpected obstacles that i was sure i was safe from.