--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: ""
comment: 
- !ruby/struct:SM::Flow::P 
  body: This returns the full content type of this message converted to lower case.
- !ruby/struct:SM::Flow::P 
  body: If there is no content type header, returns the passed block is executed and its return value is returned. If no block is passed, the value of the <tt>default</tt> argument is returned.
full_name: RMail::Header#content_type
is_singleton: false
name: content_type
params: (default = nil) {|| ...}
visibility: public
