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Question US LLC Forms 5472/1120 digital signature ?

I heard that if it is sent in on paper, they may actually check the ink. But if it's faxed, then obviously they cannot check the ink. I'd try my best to make sure it looks as real as possible. I wonder what they do if they decide the signature doesn't look inked. Would they throw it out? Would they send back a rejection letter?

I also wonder how it works when you are dealing internationally with a professional registered certified accountant, a lot of this stuff is done over email rather than in person.
 
I mean PDF digital signature then fax it to the IRS.
Afaik, you cannot fax the form. You can only mail by paper or e-file.

I paid an accountant to do mine and he did a digitally signed signature. Apparently it's fine.
They use a software and do e-file

https://www.irs.gov/instructions/i1120f
Where To File
File Form 1120-F with the Internal Revenue Service Center, P.O. Box 409101, Ogden, UT 84409.

Corporations can generally electronically file (e-file)

Waiver requests can also be faxed to 877-477-0575. Contact the e-Help Desk at 866-255-0654 for questions regarding the waiver procedures or process.

Depending on your state, you can e-file directly with IRS:
https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free