![](http://www.gnu-darwin.org/hexley-gd-sm.png)
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# File lib/rmail/header.rb, line 606
def set_boundary(boundary)
params = params_quoted('content-type')
params ||= {}
params['boundary'] = boundary
content_type = content_type()
content_type ||= "multipart/mixed"
delete('Content-Type')
add('Content-Type', content_type, nil, params)
end
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