This is well know problem, but not with mailman. See https://bugs.launchpad.net/mailman/+bug/265915 which you will notice is rejected as invalid. Mailman folds long subject lines with <CR><LF><TAB> replacing the first convenient space character, which is perfectly legal according to RFC2882. The real problem is with mail reading programs (MUAs) that  strip these characters out for display thus concatenating the words in the subject line.  Even worse some of them use the stripped out version in the subject lines of replies or forwards. As far as keeping  threads together, this is not a problem for mailman or properly implemented threading programs that organise threads based on the content of the In-Reply-To: and References: headers not the subject line.

Roger

Robert Osfield wrote:
Hi Paul,

I work out what you mean by remove spaces from subject line as I
haven't noticed anything like sice.  Could you give an example.

As far as I know mailman doesn't modify the subject line save for
prepending the [osg-users].

Robert.

On Tue, Dec 9, 2008 at 5:59 PM, Paul Martz <[EMAIL PROTECTED]> wrote:
  
Just curious if anyone else has a mail client that is unable to organize
messages by thread because of this issue. Any ideas how to fix it?

Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com
+1 303 859 9466

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