single instance message store problem.

[Nic Bernstein]

On 05/29/2015 03:30 PM, Michael Neumann wrote:
> Am 29.05.2015 um 22:19 schrieb Ken Murchison:
>> Also, are you sure that your MTA isn't breaking up the recipients into
>> separate LMTP transactions?  lmtpd can/will only do single instance
>> store for recipients that are part of the same transaction (MAIL FROM,
>> RCPT TO, DATA sequence).  If the recipients are sent one at a time with
>> duplicate DATA commands, there are treated as distinct messages.
> That is the problem, postfix default local transport does only one at a
> time, that breaks single instance storage. We had to redefine it to:
> local_transport = lmtp:unix:/lmtp/lmtp
> Please read about the consequences in postconf manual.
>
> Hope that helps

Michael is right on the money here.  I hadn't noticed that you had 
defined mailbox_transport rather than local_transport.

This is our typical postfix configuration in support of singleinstancestore:

    local_recipient_maps = ldap:/etc/postfix/local_recipient_map.ldap,
             ldap:/etc/postfix/alias_map.ldap
    local_transport = lmtp:unix:/mailstore/lib/imap/socket/lmtp
    local_destination_recipient_limit = 300
    local_destination_concurrency_limit = 5

The warnings Michael was referring to are covered in 
http://www.postfix.org/LOCAL_RECIPIENT_README.html

Specifically, if one overrides the local_transport, it's important that 
one also properly qualifies all local_recipients (quoting):

    Problem: you don't use the default Postfix local(8)
    <http://www.postfix.org/local.8.html> delivery agent for domains
    matching $mydestination
    <http://www.postfix.org/postconf.5.html#mydestination>,
    $inet_interfaces
    <http://www.postfix.org/postconf.5.html#inet_interfaces>, or
    $proxy_interfaces
    <http://www.postfix.org/postconf.5.html#proxy_interfaces>. For
    example, you redefined the "local_transport
    <http://www.postfix.org/postconf.5.html#local_transport>" setting in
    main.cf <http://www.postfix.org/postconf.5.html>.

    Solution: your local_recipient_maps
    <http://www.postfix.org/postconf.5.html#local_recipient_maps>
    setting needs to specify a database that lists all the known user
    names or addresses for that delivery agent.

In our case we most often use LDAP for this, as shown above, but 
whatever DB is best for you, etc.

Cheers,
     -nic

-- 
Nic Bernstein                             nic at onlight.com
Onlight llc.                              www.onlight.com
219 N. Milwaukee St., Ste. 2A	          v. 414.272.4477
Milwaukee, Wisconsin  53202		  f. 414.290.0335

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