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As far as the CRLF transformation goes:   
1. do I do the same transformation on Windows?  
2. do I perhaps do the reverse transformation on Windows, turning LF  
from unix clients to CRLF (and similarly, CR from Macs to CRLF)?  
3. what do I do on Mac OS?  
4. should I always convert line endings to plain LF regardless of OS? 
Would this confuse Windows users just as the current situation is 
confusing Unix users? 
5. should the quoted-printable encoding be quoting the CRs? 
 
Or, as already stated: do I just encourage users to get reasonable  
email clients that can handle the line endings correctly?