mail: ensure that Python2.4 to 2.7 use the same header format
Wrapping format for long headers changed in Python2.7 (see Python issue1974). Adopt the Python2.7 behaviour and backport it for 2.4-2.6
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Wrapping format for long headers changed in Python2.7 (see Python issue1974). Adopt the Python2.7 behaviour and backport it for 2.4-2.6