We have two servers with Merak Mail Server, serving a considerable number of accounts (15000). We had a terrible problem with our storage server, and we've been forced to move the mails to other server.
We don't know why, but email clients (Outlook, Thunderbird) are downloading again all the mails that were stored. Is there any way to force the clients to download only from now?
I've seen the option in GMAIL, but I haven't seen comercial package with that option.