I think the Zimbra forum has more specialized knowledge like that than here.
Here is what i think youre after.
https://wiki.zimbra.com/wiki/Restrict_account_from_sending_emails_to_all_domains

Posts
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RE: need to setup accounts from sending emails to only one domains in zimbra and restrict all domains
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RE: Gaming - What's everyone playing / hosting / looking to play
Just bought ASUS 1080 Strix, for $550+10%tax. Still 200 dollars more than they should be but less than 2 months ago when they were about 800/each.
Couldnt take the failing fan bearing noise in my 290 anymore, and i should get 2x the performance and much less power usage for games and BOINC. -
RE: Need Server 2008 R2 cleanup help
I used this at home a while ago, due to one of my windows installs being xp64>vista64>7>10.
http://www.homedev.com.au/free/patchcleaner
Never used it on a server though. -
RE: What Are You Watching Now
@black3dynamite Yea they dont make em like that anymore. A classic.
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Ads for 3rd party stuff in Win10 1803...
Seriously wtf.
Just installed 1803 on a computer, hit start and there is this Dolby Access shit in the middle of the start menu. It is a store app that is an ad for Dolby Atmos headphones, yet looks like it is just a regular windows program in the Start Menu. -
RE: top vs htop
That and one about other things like htop and others like glances.
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RE: top vs htop
There is a thread about this already somewhere, but searching yield nothing, as usual.
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RE: Gaming - What's everyone playing / hosting / looking to play
Ive been playing Warframe this week. First time putting more than a few minutes in. No idea what the story is, but the combat is fun. The 'space bucks to buy fake things with real money' for this are 50% off during Summer Sale, will probably get one.
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RE: Miscellaneous Tech News
@wrx7m I love how even the people working at MS dont bother with showing the contents of This PC because it is sooo bad. The pictures on that site would have had to be twice as high vertically.
Also this tool has the same problem that @scottalanmiller pointed out with their SharePoint Online tool; it only works for data going to MS, not the other way round.
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RE: What Are You Watching Now
tried watching The Last Jedi again. Just one of the worst movies ever made in cinema history, not just Star Wars.
Real Darths Dont Cry -- im putting that on a tshirt
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RE: Gaming - What's everyone playing / hosting / looking to play
Dawn of War 3 bought during Steam sale. Like it so far
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RE: What Are You Doing Right Now
The training is $50/month, not bad. Also available at some community colleges. Would need to know the quality of it though. Also the salary they state seems way too high for desktop support, unless that is average in SF or somewhere else.
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RE: Miscellaneous Tech News
@black3dynamite Downloaded from UW in less than 1 min. Installing now as a vm
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Purpose of expired certs on all computers?
These certificates are on every Windows computer in the world. Why?
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RE: Miscellaneous Tech News
Look at these corporate crime apoplogists. Seriously, corps need to be smacked down regularly. Even small ones. Companies being forcibly shut down for malfeasance should be a regular thing.
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RE: Random Thread - Anything Goes
Eat more vegetables if it takes you that long.