(04-17-2015, 01:31 AM)dsapikas Wrote: So, how can i configure only on client to access their already owned mail exchange servers through sentora's webmail, without moving them ?
That would be rather problematic and involve more work than is needed.
Why not just install roundcube or similar on their already working server?
Alternatively, setup a sub-domain from their domain, such as webmail.domain.tld and add that to sentora, then install a new roundcube setup on that host.