At 18.51 +0000 1999-02-11, D. J. Bernstein wrote:
the vast majority of deployed MTAs cannot handle 8bit headers,
Data points: qmail is 8-bit-clean. sendmail (8.8.0 and above) removes
bytes 128-159. The Cyrus IMAP toaster, apparently, bounces any message
with an 8-bit header field. Any other reports?
Gateways to non-SMTP environments generally can not handle 8-bit
characters in headers. With can not I talk about anything between
crashing to non-delivery of that specific message, to just passing on
the data as being corrupt. The gateway itself can though handle QP or
Base64 CTE in the body and headers correctly.
Patrik