[0 means default timeout,\n-1 means no timeout]
[Open mailbox]
[* Primitive type system\n]
[* No overloading\n]
[* Limited possibility of data abstraction, polymorphism, subtyping and code reuse\n]
[* No metaprogramming except preprocessor macros\n]
[* No exceptions]
[subject\n    %s\nfrom\n%s]