Muwop was one of the five O Blockers arrested last week by the feds for killing Chiraq rapper FBG Duck.

He's facing murder and RICO charges, so that's life-in-prison type stuff.

But Muwop isn't sweating it.

In an email to a friend, Muwop says it's all good.

"I'm great and thanks for reaching out my head as it could be love for reaching out ill be out soon," he typed.

The feds busted Muwop and company in part because they wouldn't shut up on social media.  So maybe he should stop emailing too.