TMZ has obtained a letter that Melissa Smith -- Jesse James mistress #2 -- faxed to Sandra Bullock's agent on Sunday, apologizing for her alleged affair with Jesse ... and it's pretty audacious.
Smith wrote to Sandra, "I felt I needed to reach out to you and tell you how deeply sorry I am for everything that you've been through."
Smith goes on ... "And I know nothing I can say in this letter is going to make the pain of my actions go away."
And the mea culpa continues: "... I am sorry for any hurt or pain that I have caused you. My actions of engaging with a married man are unforgivable. I never meant you any harm."
Smith continues, "I compromised my beliefs on several occasions and as a result will never forgive myself."
Melissa closes the letter, "Please contact me if you wish to discuss on the phone or in person."
Don't wait by the phone, honey.
Jesse's Mistress to Sandra:
4/26/2010 10:30 AM PDT BY TMZ STAFF
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