Incorrect Subject header encoding for long non-ascii line
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                 Key: GERONIMO-3842
                 URL: https://issues.apache.org/jira/browse/GERONIMO-3842
             Project: Geronimo
          Issue Type: Bug
      Security Level: public (Regular issues)
          Components: mail
    Affects Versions: 2.0.2
            Reporter: Andrey Utkin


Method MimeMessage.setSubject(subj, enc) when "subj" long enough and includes non-ascii characters  produce incorrect Subject header.
Using "subj":
{code}
Проверка. Достаточно длинная тема пиьма. Проверка. Проверка.
{code}
"enc": UTF-8

Subject header looks like:
{code}
Subject:      =?UTF-8?B?0J/RgNC+0LLQtdGA0LrQsC4g0JTQvtGB0YLQsNGC0L7Rh9C90L4g0LTQu9C40L3Q?==?UTF-8?B?vdCw0Y8g0YLQtdC80LAg0L/QuNGM0LzQsC4g0J/RgNC+0LLQtdGA0LrQsC4g0J/R?==?UTF-8?B?gNC+0LLQtdGA0LrQsC4=?=
{code}

So, there is none line breaks (folding) near "?==?UTF-8?". 
There is a lot of mail clients which can`t parse this header correctly.


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