Search found 151 matches

by bhwong
Wed Nov 02, 2016 7:32 am
Forum: Administrators
Topic: SDA storage cleanup
Replies: 0
Views: 547

SDA storage cleanup

Our Zimbra's SDA is running out of storage. For Ubunut, beside /tmp and /var/cache/apt/archives, which other folders can I safety delete to free up storage? For Zimbra, is it safe to delete files in /opt/zimbra/data/tmp as long as the date is not current? Which other folders in Zimbra can we clean u...
by bhwong
Wed Oct 26, 2016 2:11 am
Forum: Administrators
Topic: Corrupted preference
Replies: 0
Views: 644

Corrupted preference

One account appears to have a corrupted preference such that it is not able to save any changes. An error message will appear when saving - A required value is either missing or invalid. I notice there is a long rubbish string in the trusted addresses. I tried to remove it and save but it still give...
by bhwong
Wed Oct 26, 2016 1:57 am
Forum: Administrators
Topic: Overcome hacked account, spams and blacklisting
Replies: 1
Views: 1223

Overcome hacked account, spams and blacklisting

Recently one of our user account got hacked and was abused for sending out spams. This resulted in our Zimbra IP to get blacklisted. 1. Is it possible to restrict the rate of outgoing email? And automatically disable accounts that sent out too many email too fast? policyd is not very useful because ...
by bhwong
Mon Jul 25, 2016 4:33 am
Forum: General Questions
Topic: wscript.exe?
Replies: 1
Views: 1268

wscript.exe?

Sophos has recommended blocking of wscript.exe to prevent ransomware but after blocking, we realize that Zimbra Desktop cannot run because it require wscript.exe. Any workaround?

btw, I can't attach image here. It said: Sorry, the board attachment quota has been reached.
by bhwong
Fri Jul 08, 2016 2:50 am
Forum: Administrators
Topic: How to manage huge amount of Authentication Failure?
Replies: 4
Views: 5081

How to manage huge amount of Authentication Failure?

Our Zimbra server has an average of about 10-20k of authentication failure attempts everyday, trying to login to our accounts by guessing their passwords with bots. As we have difficulty upgrading our Ubuntu from version 10 to 12 due to unauthenticated packages found error, we are unable to enjoy th...
by bhwong
Thu Jun 16, 2016 9:57 am
Forum: Administrators
Topic: /opt/zimbra/conf/auditswatchrc.in removed in ZCS 7 OS ?
Replies: 10
Views: 1922

Re: /opt/zimbra/conf/auditswatchrc.in removed in ZCS 7 OS ?

Is it possible to include all accounts by entering:

zmlocalconfig -e zimbra_swatch_notice_user=*@domain.com

And how do we remove accounts from it?
by bhwong
Thu Jun 16, 2016 8:49 am
Forum: Administrators
Topic: Failed Login Policy Question
Replies: 4
Views: 1391

Re: Failed Login Policy Question

2.png Can you also explain what does "Time to lockout the account" and "Time windows in which the failed logins must occur to lock the account" mean? The explanation I read are not very clear about these settings. Does this mean if I login 5 times with the wrong password within ...
by bhwong
Wed Jun 08, 2016 3:24 am
Forum: Administrators
Topic: Reliable Android email for Zimbra?
Replies: 2
Views: 672

Re: Reliable Android email for Zimbra?

Thanks for the suggestion. I will get my users to give gmail a try. They prefers K9 over the default email app.
by bhwong
Wed Jun 08, 2016 2:42 am
Forum: Administrators
Topic: Zimbra does not send e-mail to Microsoft domain
Replies: 17
Views: 7734

Re: Zimbra does not send e-mail to Microsoft domain

I have setup spf, DKIM and DMARC. And Microsoft Delivery Team has told me that they found no issue with our email server. So it is puzzling. For those who want to verify, visit these sites: https://postmaster.live.com/snds/index.aspx https://mail.live.com/mail/troubleshooting.aspx https://mail.live....
by bhwong
Wed Jun 08, 2016 2:25 am
Forum: Administrators
Topic: Beware of ransomware coming in as email attachment as .lnk
Replies: 0
Views: 655

Beware of ransomware coming in as email attachment as .lnk

Since .lnk is not blocked by default in Zimbra, I think every administrator should add this in here: 1.png Check this out: https://blogs.technet.microsoft.com/mmpc/2016/05/26/link-lnk-to-ransom/ Even Singapore government is blocking internet access for their civil servants to reduce such security ri...

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