Can I Submit a Professor's Recommendation Letter from my Personal E-mail? I'm currently applying to a Chem Eng PhD in the US.
One of my professors wrote me a recommendation letter, but requested me to submit it myself to the university's website using my personal e-mail, as he will be very busy with some year-end obligations.

Is it okay to do such a thing? I cannot find any information about if this is acceptable or not...

Of course, I wrote an explanation on the page right before the Recommendation Letter, explaining the situation and listing his contact information if they ever need to confirm its authenticity.

Thank you for your answers!
This seems like a bad idea and I would do it only as a last resort.  Even with the disclaimers, it could raise questions in the reader's mind as to whether you forged the letter.  I think it was not appropriate for the professor to ask you to submit it yourself.

If the letter writer isn't able to submit the letter himself, a common alternative is for some other university employee, such as an administrative assistant, to submit the letter.  I would suggest pushing for something like this.