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# This file is released under the GNU GPL, version 3 or a later revision.
# For further details see the COPYING file
import email.policy as _p
import email.headerregistry as _hdr
from . import headers as HDR
# here we define our custom policy that handles additional headers
_headers = {
HDR.X_BEEN_THERE : _hdr.UniqueAddressHeader,
HDR.X_MAILING_LIST : _hdr.UniqueAddressHeader,
HDR.MAIL_FOLLOWUP_TO : _hdr.UniqueAddressHeader,
HDR.MAIL_REPLY_TO : _hdr.UniqueAddressHeader,
}
# derive from SMTP, but create a new instance to get our own
# instance of header_factory
p = _p.EmailPolicy() + _p.SMTP
for h, t in _headers.items():
p.header_factory.map_to_type(h, t)
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