my $f = Mail::Message::Field::Unstructured->new(Comments => 'hi!');
See SYNOPSIS in Mail::Message::Field::Full
Unstructured fields do contain information which is not restricted in any way. RFC2822 defines some unstructured fields, but by default all unknown fields are unstructured as well. Things like attributes and comments have no meaning for unstructured fields, but encoding does.
See DESCRIPTION in Mail::Message::Field::Full
See Field syntax in Mail::Message::Field
See Folding fields in Mail::Message::Field
See Structured fields in Mail::Message::Field
See Comments in fields in Mail::Message::Field
See Getting a field in Mail::Message::Field
See Using get() field in Mail::Message::Field
See Using study() field in Mail::Message::Field
See Using resent groups in Mail::Message::Field
See The field's data in Mail::Message::Field
See Access to the field in Mail::Message::Field
See Using simplified field access in Mail::Message::Field
See Specifying field data in Mail::Message::Field