[Dovecot] Wiki needs updating: Dovecot LDA + Dovecot Sieve + Exim

[Stephen Usher]

So as to make sure that Dovecot Sieve's vacation system works Exim has to be 
forced to generate a "Reply-To:" header in the message (which it doesn't do 
by default). The current example for using the Dovecot LDA with Exim doesn't 
do this.

Here is a replacement example for the local_delivery transport:-

local_delivery:
  driver = pipe
  command = /usr/local/libexec/dovecot/deliver -d $local_part
  message_prefix =
  message_suffix =
  log_output
  delivery_date_add
  envelope_to_add
  return_path_add
  headers_add = Reply-To: ${if def:header_reply-to:{$h_reply-to:}{$h_from:}}
  #group = mail
  #mode = 0660

Basically, if the Reply-To: header exists than it merely gets overwritten with 
itself. If it doesn't then the header is created and the contents of the From 
header is put into it.

If this is not done then the libsieve over restrictive rules (requiring 
a "Reply-To:" header even though the RFC doesn't require it) will not allow 
the vacation system to work.

Steve
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