On May 24, 2011, at 3:55 AM, Ian Eiloart wrote: > > On 23 May 2011, at 23:10, Franck Martin wrote: > >> There is an interesting post today on >> http://chilli.nosignal.org/mailman/listinfo/mailop about exim and 8bit >> >> It seems they will stop to downgrade. > > Exim doesn't downgrade. It doesn't advertise 8bitmime either, by default. If > you switch on 8bitmime advertising, it still doesn't downgrade. I think it > just tries to deliver the mail as 8bit, regardless of what the receiving MTA > does. I think postfix and sendmail do the same, but I'm not sure.
Exchange advertises 8bit and then bounces the mail if it tries to forward it to a server that doesn't advertise 8bit. This (entirely RFC valid yet completely broken) behaviour has bitten me a couple of times. I'm not sure any of this affects DKIM much, other than "Hey, look! Yet another way DKIM signatures might get removed in transit!". Cheers, Steve _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
