loongson/pypi: links for mailtools

loongson/mirror mailtools-3.0.1.tar.gz
loongson/mirror mailtools-3.0.1-py3-none-any.whl
loongson/mirror mailtools-3.0.0.tar.gz
loongson/mirror mailtools-3.0.0-py3-none-any.whl
loongson/mirror mailtools-2.1.tar.gz
loongson/mirror mailtools-2.tar.gz
loongson/mirror mailtools-1.tar.gz