--On Thursday, September 26, 2013 4:38 PM -0400 Wietse Venema
<wie...@porcupine.org> wrote:
Quanah Gibson-Mount:
One of our customers has an interesting setup where they did the
following:
a) Created 50 users
b) Added a secondary address for the 50 users to an external server with
50 users (So any email sent to user@server also gets copied to
user@server2).
c) Created a list with the 50 users as members. Lists are just a simple
ldap member: of list.
If an email is sent to the list:
The 50 users on the server each get a copy
The 50 users on the second server get two copies
I've verified I can recreate this issue with a list of 30 users with the
same configuration. I don't see it with a list of 25 users. I'm sure
there's a postconf key that would control this, but I haven't had any
luck tracking it down. Thoughts welcome. ;)
Suggestions:
1) Look at the maillog files of primary and secondary server, with
particular attention to the nrcpt and orig_to fields.
Ok, will do.
2) 50 Is a magical number; it is the default_destination_recipient_limit
(the number of recipients per SMTP mail transaction). When a queue
file has more than 50 SMTP recipients, these will be delivered in
more than one mail transaction.
Definitely not this, the first thing I tried was changing this value from
50 to 300. ;)
3) Postfix tries to preserve the x-original-to address by default,
meaning it will not eliminate duplicate recipients of the same
message that differ in the x-original-to address.
Ok, thanks.
--Quanah
--
Quanah Gibson-Mount
Architect - Server
Zimbra Software, LLC
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