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

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: Returns the message ID for this mail object instance.
- !ruby/struct:SM::Flow::P 
  body: If the message_id field does not exist, returns nil by default or you can pass in as the parameter for what you want the default value to be.
- !ruby/struct:SM::Flow::P 
  body: "Example:"
- !ruby/struct:SM::Flow::VERB 
  body: " mail = TMail::Mail.new\n mail.message_id #=&gt; nil\n mail.message_id(TMail.new_message_id) #=&gt; &quot;&lt;47404c5326d9c_2ad4fbb80161@baci.local.tmail&gt;&quot;\n mail.message_id = TMail.new_message_id\n mail.message_id #=&gt; &quot;&lt;47404c5326d9c_2ad4fbb80161@baci.local.tmail&gt;&quot;\n"
full_name: TMail::Mail#message_id
is_singleton: false
name: message_id
params: ( default = nil )
visibility: public
