RFC regarding this topic looks quite complicated to me, but I know that \r\n is used for line breaking in e-mail headers and \n is not. So in my opinion it shouldn't be treated the same like \n. The \r\n should be removed in parsed text, but \n should be preserved like any other character. So I don't think "universal newline mode" is correct approach to read raw e-mails.

I have tested policies in python3 - you have right - it works. But I cannot use it because of application incompatibility with python3.

I was hoping it will be easy to fix for some more experienced than me... If not - you can close issue and I will stay with present solution (removing \r\n).

Thanks for all your help!