On a very busy Imap server , duplicate suppression sometimes becomes the bottleneck I have seen that If I disable duplicate suppression , my lmtp deliveries are speeded up. Duplicate suppression is important , but the database need not persist for very long. I have seen in most of the cases if there is a duplicate mail ( due to forwards , groups etc ), it arrives within 10 minutes of the first mail ( Any exception to this is too minor and can be ignored ) IMHO There should be a configuration that the deliverdb can be, optionally, stored in memcached or directly in memory. Of course there are cons .. like loss of data on restart etc. But these are OK. Thanks Ram ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/