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Question eFax service recommendations for IRS tax forms?

I am looking for a fax service that is trustworthy enough to file IRS forms with it (non-resident).

I can find a few options online but I am not sure which one to choose.

Do you have any recommendations, please?

I believe it should be trustworthy enough to send confidential documents such as tax forms, and it should give a fax confirmation (to prove to the IRS that I faxed my tax forms).

I am looking for an option with a flat fee or a one-month subscription (yearly subscriptions are overly pricey and I will probably never use the fax service again until next year).

Thank you.