Josh Whitver wrote:
As I understand it, this should allow us to send mail to "Conference+<shared
mailbox name>@<domain>" and have the message delivered to the shared mailbox. This isn't what's happening, however. Initially, there was no mail-capable
user named "Conference", so I created one, but now all mail sent to the address
above gets delivered to the "Conference" user Inbox, not the shared mailbox.
I just went through this myself last week :-)
The Postfix 'local' process won't accept mail for users it can't identify, so it does not think there is a valid local recipient for 'Conference' unless you add it as a user, which doesn't accomplish what you want.
Instead, you need to make two changes in your Postfix main.cf:
First, add "recipient_delimiter = +", so that Postfix will ignore the "suffix" after the username when looking for a match.
Second, if you don't already have a 'local_recipient_maps" line, add one using the default contents (which are shown in the local(8) man page).
Third, create a file in your Postfix config directory called 'shared_folders', with contents like this:
Conference yes
(the second token can be anything, it just has to be present). In the Postfix config directory, run "postmap hash:shared_folders" to create a hash db from this file. Finally, add 'hash:shared_folders" to the end of the local_recipient_maps line in main.cf and restart Postfix.
There is one downside to this configuration: Postfix will accept mail addressed to Conference+<anything>, then Cyrus will reject it if there is no matching folder. If you wish, you can list each valid shared folder in the shared_folders file, and don't add the 'recipient_delimiter' option to main.cf, which will avoid this problem but require more maintenance as you add/remove folders.
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