[Dovecot] Dovecot LDA/LMTP vs postfix virtual delivery agent and the x-original-to header
Daniel L. Miller
dmiller at amfes.com
Sat Apr 7 21:06:48 EEST 2012
On 4/6/2012 1:00 PM, Charles Marcus wrote:
> On 2012-04-06 2:53 PM, Daniel L. Miller <dmiller at amfes.com> wrote:
>> I'm currently using Postfix 2.7, Dovecot 2.1, and the Dovecot LDA. I
>> have a pure virtual user environment stored in LDAP. My messages include
>> X-Original-To and Delivered-To headers.
> Well that is great news... at least I'll be able to use the LDA, if
> not LMTP...
> Thanks! :)
>> I had difficulty getting the LMTP transport to work previously - I may
>> revisit that.
> If you do, by all means reply back on whether or not the headers are
> still there...
> Thanks again,
From the documentation...
The*virtual*(8) <http://www.postfix.org/virtual.8.html> delivery agent prepends a "*From* /sender/
/time/*_*/stamp/" envelope header to each message, prepends a
*Delivered-To:* message header with the envelope recipient
address, prepends an*X-Original-To:* header with the recip-
ient address as given to Postfix, prepends a*Return-Path:*
message header with the envelope sender address, prepends
a> character to lines beginning with "*From* ", and appends
an empty line.
Using the Postfix pipe agent, which is what is used with the Dovecot LDA,
Optional message processing flags. By default, a
message is copied unchanged.
*B* Append a blank line at the end of each mes-
sage. This is required by some mail user
agents that recognize "*From* " lines only
when preceded by a blank line.
*D* Prepend a "*Delivered-To:* /recipient/" message
header with the envelope recipient address.
Note: for this to work, the/transport/*_desti-*
*nation_recipient_limit* must be 1 (see SIN-
GLE-RECIPIENT DELIVERY above for details).
The*D* flag also enforces loop detection
(Postfix 2.5 and later): if a message
already contains a*Delivered-To:* header with
the same recipient address, then the message
is returned as undeliverable. The address
comparison is case insensitive.
This feature is available as of Postfix 2.0.
*F* Prepend a "*From* /sender time/*_*/stamp/" envelope
header to the message content. This is
expected by, for example,*UUCP* software.
*O* Prepend an "*X-Original-To:* /recipient/" mes-
sage header with the recipient address as
given to Postfix. Note: for this to work,
must be 1 (see SINGLE-RECIPIENT DELIVERY
above for details).
Unfortunately, the docs for the ltmp agent
http://www.postfix.org/lmtp.8.html don't say anything about adding these
headers. I tried asking on the Postfix list - didn't get much of an
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