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Speed of your server isn't the only factor in determining the speed of access to the accounts it holds. Is there any firewall or SElinux enabled on the server?
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No, iptables is off, SElinux is off
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If you're behind a NAT router have you set-up a Split DNS and is it set-up correctly (check the 'Verify...' section of the article)?
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No, I have public IP, I don't have NAT so I understand I don't need Split DNS
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What else is running on the server? Is the Zimbra server a VM or on real hardware? Have you looked at any of the running processes to see if there's any problems? etc., etc., etc.
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This is dedicated server only for Zimbra, I turned off any others processes,
anyway.. I use The BAT for communicate with Zimbra which has rich debug and what I see: I use POP3 to check emails with STARTTLS, when I click "get mail" debug show "The initiation phase of TLS" . .and this take about 20s! , then in debug I get "TLS validation phase error: Invalid server certificate (could not find the publisher of the certificates)." and in The Bat I get popup window with message "The server did not provide the root certificate during the session and there is no such certificate in your address book. Continue?" When I click OK.. he check emails. Why this is taking so long ?
second case.. when I try to connect with client (thunderbird or the bat) with POP3 or IMAP, but without! tls,ssl I get errors.. such as "-ERR only valid after entering TLS mode" , what is going on ? Zimbra in default doesn't support "clean" protocols ?
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In thunderbird you need to Subscribe to additional folders if you're using IMAP.
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this helped, thanks