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It's a good idea to match your Zimbra MTA hostname given during an EHLO with the hostname associated with your public IP address.su - zimbra
zmprov mcf zimbraMtaMyHostname mail.example.com
zmcontrol restart
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My domain name registrar offers email aliases and forwarding; however, this feature causes my mail server's SPF checks to fail because the registrar's mail relay sends on behalf of the originating server. I fixed it by white-listing the registrar's mail relay IP block in SpamAssassin.
Read more: Zimbra - Add Trusted Relay to SpamAssassin
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By default Zimbra automatically discards inbound mail that receives a high spam score (aka "super spam"). Although the score is configurable up to 100, this default could cause false positive email to disappear and make troubleshooting spam scoring difficult.
Change the default behavior using these commands:
su - zimbrazmprov mcf zimbraAmavisFinalSpamDestiny D_PASS zmprov ms <mta server> zimbraAmavisFinalSpamDestiny D_PASS
zmcontrol restart
Choose from these values:
D_PASS -> Deliver all spam regardless of score
D_BOUNCE -> Generate a bounce message
D_REJECT -> Reject the message
D_DISCARD -> Silently discard the message (default)
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THE SITUATION
Some of my end-users do this from time to time: They open an Outlook attachment (such as a Word doc), edit it, save it, then close it. Where is it!? It's buried in Outlook's temp file folder, dude!
THE SOLUTION
* Turn OFF "Hide protected operating system files" in Windows Explorer.
* Navigate to this path: C:\Users\USERNAME\AppData\Local\Microsoft\Windows\Temporary Internet Files
* You'll find a folder in there called "Content.Outlook" that should contain the missing files. If the "Temporary Internet Files" folder appears as a big mess, then try accessing the path via UNC, instead of locally.
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Although I adore running my own mail server, I was curious about Google Apps for Work, specifically Gmail for Work. Could it block spam as effectively as my own insanely-aggressive rig? Also, if I ever got tired of managing my own server or (gasp) something hugely disastrous happened to my infrastructure, I figured Google Apps could serve as an apposite alternative or fall-back solution. If nothing else, perhaps I could add this experience to my IT resume. They offer a free 30-day trial, so I didn't have anything to lose.
I don't think it's necessary to go into excessive detail because I'm sure Google Apps for Work is already well-covered on the web, but long story short--it's an incredible bargain. Google offers a tremendous number of features for the price--to the point it can be overwhelming. In the end, however, I did miss the customizability of running my own mail server, so I asked Google support a couple questions. My questions are below along with their answers.
Read more: My 30-Day Trial of Google Apps for Work