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From: Michael Orlitzky on 1 May 2010 20:51
From http://www.postfix.org/postconf.5.html#canonical_maps,

Note: with Postfix version 2.2, message header address mapping
happens only when message header address rewriting is enabled:

* The message is received with the Postfix sendmail(1) command,
* The message is received from a network client that matches
$local_header_rewrite_clients,
* The message is received from the network, and the
remote_header_rewrite_domain parameter specifies a non-empty value.

It is not immediately clear whether these conditions are and/or. A
possible clarification would be to add "Header address rewriting is
enabled when any of the following are true:" prior to the list.

From: /dev/rob0 on 1 May 2010 21:52
On Sat, May 01, 2010 at 08:51:27PM -0400, Michael Orlitzky wrote:
> From http://www.postfix.org/postconf.5.html#canonical_maps,
>
> Note: with Postfix version 2.2, message header address mapping
> happens only when message header address rewriting is enabled:
>
> * The message is received with the Postfix sendmail(1) command,
> * The message is received from a network client that matches
> $local_header_rewrite_clients,
> * The message is received from the network, and the
> remote_header_rewrite_domain parameter specifies a non-empty
> value.
>
> It is not immediately clear whether these conditions are and/or. A
> possible clarification would be to add "Header address rewriting is
> enabled when any of the following are true:" prior to the list.

Perhaps, but note that the first condition is exclusive of the
following two. A message might arrive via sendmail or via the
network, but not both.
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From: Michael Orlitzky on 1 May 2010 22:39
On 05/01/10 21:52, /dev/rob0 wrote:
> On Sat, May 01, 2010 at 08:51:27PM -0400, Michael Orlitzky wrote:
>> From http://www.postfix.org/postconf.5.html#canonical_maps,
>>
>> Note: with Postfix version 2.2, message header address mapping
>> happens only when message header address rewriting is enabled:
>>
>> * The message is received with the Postfix sendmail(1) command,
>> * The message is received from a network client that matches
>> $local_header_rewrite_clients,
>> * The message is received from the network, and the
>> remote_header_rewrite_domain parameter specifies a non-empty
>> value.
>>
>> It is not immediately clear whether these conditions are and/or. A
>> possible clarification would be to add "Header address rewriting is
>> enabled when any of the following are true:" prior to the list.
>
> Perhaps, but note that the first condition is exclusive of the
> following two. A message might arrive via sendmail or via the
> network, but not both.

Agreed, and the possibility of (first item or (second item and third
item)) is eliminated by the examples and a quick check of some default
values.

But, you have to know how Postfix works already to come to that
conclusion. Does localhost count as a network client? Where would one go
to find an answer to that? If so, does sendmail from localhost fall
under conditions 2 or 3? How does Postfix's sendmail command work,
anyway? And so on.

If the documentation-quest can be avoided (or at least shortened) with
the addition of one sentence, I think it's beneficial to do so.

From: Wietse Venema on 2 May 2010 08:56
Michael Orlitzky:
[ Charset ISO-8859-1 unsupported, converting... ]
> From http://www.postfix.org/postconf.5.html#canonical_maps,
>
> Note: with Postfix version 2.2, message header address mapping
> happens only when message header address rewriting is enabled:
>
> * The message is received with the Postfix sendmail(1) command,
> * The message is received from a network client that matches
> $local_header_rewrite_clients,
> * The message is received from the network, and the
> remote_header_rewrite_domain parameter specifies a non-empty value.
>
> It is not immediately clear whether these conditions are and/or. A

You go from the first to the last, first match wins.

Wietse

> possible clarification would be to add "Header address rewriting is
> enabled when any of the following are true:" prior to the list.
>
>

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