I just started testing zimbra. I'm trying to migrate a server from qmail to zimbra. I have used extensions heavily on the old server (for use with TMDA). I'm not planning to use TMDA with zimbra yet, however I don't want to lose the mails coming to all the extension addresses I have used so far. In qmail, I used '-' as the delimiter. I tried to set the recipient_delimiter to '-' by using 'zmprov mcf zimbraMtaRecipientDelimiter -' and restarted zimbra. Now, postconf shows recipient_delimiter is in fact -, however, when I send a mail to an extension, it is being rejected as unknown user.
Do I need to take any additional steps?

Thanks in advance for any help