网址：http://www.xiaojb.com/archives/mailtech/howto_disable_8.shtml
起因(Eric Merrill )：
Is there a way to disable 8BITMIME smtp relaying. Basically Exchange
servers (4-5.5) advertise that they accept 8BITMIME encoding over
SMTP relay, but reject such messages (This is admitted by MS, and
they have a tech note on how to ‘fix’ (stop it from advertising 8bit)
exchange), but I dont have access to the destination server.
Basically my server is setup to be an authenticated SMTP relay, with
a mail client connecting directly to it, then the server relays the
message. Is there a way to stop my server from using 8BITMIME encoding?
Do I lose anything by disabling this (if possible)?
解决办法(Wietse Venema)：
Then tell Postfix not to SEND 8BITMIME to that machine.
/etc/postfix/main.cf:
transport_maps = hash:/etc/postfix/transport
/etc/postfix/transport:
example.com dumb:
/etc/postfix/master.cf:
dumb unix - - n - - smtp
-o smtp_never_send_ehlo=yes
Tags: Postfix
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