There is no historical data with the queue monitoring screen, it's a real-time view only. If there are problems you'll see messages listed on that screen.

Why would you want to do that? If your users are deleting mail then you should consider using the dumpster feature.

Did anybody used the alwayson attributes/commands? Could you please provide a link to where to find info regarding it and how to use it in production? When was this feature ever released? I though that the 'always-on' feature of ZCS was supposed to be in version 9.x and Synacor had dropped this. Pe...

What do you mean by "change the host"? You really should be on the latest (8.8.9) version of ZCS as earlier versions have security vulnerabilities, you really are exposing your users to serious problems.

Go to the Split DNS wiki article and read that, you can also check your DNS configuration by running all the commands in the "Verify...." section of that article. If you still have problems then post the output from those commands here. BTW, do not post duplicate messages in the forums eve...

Who 'owns' the server at the zimbraDNSMasterIP address? Is this under your control? Can you do a DNS lookup using the server? In any case, have you tried changing the zimbraDNSMasterIP to something else such as "1.1.1.1" or one of your choice?

Perhaps a follow-up question would be, do you have the settings for dnscache configured correctly (particularl y the DNSMasterIP) as per the wiki article: https://wiki.zimbra.com/wiki/DNS_caching_service_(dnscache)

Do you actually know where the spam is originating? Could you possibly have an infected/compromised machine on you network?

I don't really understand why you're using three DNS servers in your resolv file, you only need one DNS server in there and it should be a caching DNS server (i.e. dnscache). FWIW, I use a separate (HA/Load Balanced) DNS servers on different servers than the ZCS server, that serves all my LAN DNS re...

I have over 100 users. Therefore, I want to use two servers. Can I run Zimbra active / passive ? Why do yoyu think you need this for 100 users? Have you searched the forums and/or wiki for an HA solution. Really trhe fiorst thing you should do when you have a question is do some research by looking...