unable to reply to conversation

[griff]

Just recieved a message but unable to reply, it says : This conversation is closed for new replies, is there something suspicious about this guy?

 

[Mike L]

Which guy?

 

[VSS]

Just recieved a message but unable to reply, it says : This conversation is closed for new replies, is there something suspicious about this guy?

He's probably just accidentally clicked the "not open for replies" button when he sent it to you.
Just send him a fresh PM, instead of trying to reply to the existing conversation.