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6 changes: 3 additions & 3 deletions sendgrid/transport/smtp.py
Original file line number Diff line number Diff line change
Expand Up @@ -180,9 +180,9 @@ def _getFileMIME(self, attach):
msg.set_payload(data)
encoders.encode_base64(msg)

msg.add_header('Content-Disposition', 'attachment', filename=filename)

if attach.get('cid', False):
msg.add_header('Content-ID', '<%s>' % attach['cid'])
msg.add_header('Content-ID', '<%s>' % attach['cid'])
else:
msg.add_header('Content-Disposition', 'attachment', filename=filename)

return msg
3 changes: 3 additions & 0 deletions test/test_smtp_transport.py
Original file line number Diff line number Diff line change
Expand Up @@ -48,12 +48,15 @@ def test_smtp_transport_content_id_header(self):

f = smtp_transport._getFileMIME({'file': 'img.png', 'name': 'contents'})
self.assertEqual(None, f.get('Content-ID'))
self.assertEqual('attachment; filename="contents"', f.get('Content-Disposition'))

f = smtp_transport._getFileMIME({'file': 'img.png', 'name': 'contents', 'cid': None})
self.assertEqual(None, f.get('Content-ID'))
self.assertEqual('attachment; filename="contents"', f.get('Content-Disposition'))

f = smtp_transport._getFileMIME({'file': 'img.png', 'name': 'contents', 'cid': 'cid'})
self.assertEqual('<cid>', f.get('Content-ID'))
self.assertEqual(None, f.get('Content-Disposition'))


class FakeException(IOError):
Expand Down