Jesse James says his ex-wife - the second one, not Sandra Bullock, who he officially divorced this week - poses a serious threat to his six-year-old daughter.

He's not a fan of Janine Lindemulder.

He filed explosive documents in his custody war with Janine, including emails in which she allegedly admits to drug use, prostitution, and extreme jealousy of Bullock.

The documents show emails Janine sent to Jesse's sister, Julie James England, from 2008-2009, which Jesse claims prove Janine is a threat to daughter Sunny.

Among the shocking items: Janine Lindemulder revealed how she agreed to spend one night with a man named Pete, who would in turn pay her $25,000.

Jesse's sister warns, "this [sic] is a form of prostitution."

Jesse James' relationship with his second ex-wife is a bit contentious.

Janine goes on to complain about her daughter's relationship with Sandra Bullock, stating "all [sic] Sunny talks about is Sandy, Sandy! WTF?!" Indeed.

After begging for Vicodin from Julie James - and being denied - she wrote, "I am so depressed, Sun is suffering, I can't even find the energy to play with her."

"It's 9:30 and I don't even know what she ate today," the porn star, who's currently out on parole, added. "Not being awake makes everything better."

Maybe it's not the worst thing in the world Jesse's moving to Texas so that Sunny and his two older kids (from his first ex) can stay close to Sandra.