Line policy overflow in a header (mime.cpp)

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There is a condition for line.length() in mime.cpp parse_by_line function:

if (line.length() > string::size_type(decoder_line_policy_))
    throw mime_error("Line policy overflow in a header.");

decoder_line_policy_ is set to mailio::codec::line_len_policy_t::RECOMMENDED which equals 73.

In some cases MS Exchange mail server produces lines with larger size, leading to exception thrown.

Can this value be increased to support such messages?