How to Run a Command Stored in a Variable | PowerShell
Use the & operator to execute the content of a variable in PowerShell ... Read More
Deploying DKIM on Zimbra Collaboration Edition Server is simple compared to the difficulty of doing so on an on-premises Exchange server. As it's built into the suit, we have an easy job creating the key pairs with a single command ... Read More
We already covered how to get LE certificates for CentOS boxes, this time we incorporate that knowledge into a script to get and automatically renew the SSL certificate for our Zimbra server running on CentOS 8 ... Read More
If you are on a budget and you need an email system that doesn't require licensing and run on a modest hardware, Zimbra is a good choice. Here's how to install it on CentOS 8 ... Read More
On-premises Exchange servers have no built-in DKIM modules, so a 3rd party software is needed to implement DKIM (detailed here), but luckily in Office 365 setting up the DKIM signing process is very simple ... Read More
In this lab we take a look at triggering instant replication of both AD objects and their special subset: DNS zones ... Read More
It's a quick guide to install a postfix server on CentOS, that can receive incoming email from the internet. In our lab we use our protectigate.com domain, and a user mailbox john@protectigate.com, who will receive our test email ... Read More
Address lists are built-in features in the Exchange messaging system, there is always at least one global address list that users can use to look up other users in the organization. They can either use the Address Book button in ... Read More
Alice wants to set Abigail's out of office message in her absence. Also, she needs to send email messages out from Abigail's mailbox which she's able to do anyway, as she was given send-as permissions to Abigail's mailbox, but each ... Read More
If for some reason a passive copy of a mailbox database in a DAG gets corrupted (see screenshot below), the safest way to fix the issue is by reseeding the database ... Read More
In this lab we take a look at the special ImmutableID property of the Microsoft Online user accounts. This property is used when we synchronize on-prem AD accounts to the cloud. The ImmutableID shows the hybrid system which on-prem account ... Read More
Password hashes are synchronized separately from the user account to the Azure Active Directory by AADSync. If there are issues with hash sync for certain users or even whole domains, there is a great built-in tool to diagnose the issues ... Read More
An interesting test is how to migrate user mailboxes between two on-prem Exchange systems that have no connection whatsoever, other than a plain network connection through the internet. They belong to different forests, and there are no trust relationships set ... Read More
During onboarding or offboarding Office365 migration batches are created with collections of users to first sync the given users' mailboxes to or from the cloud, and keep it synced until they are completed. When whole batches are completed, all mailboxes ... Read More
Installing an NFS file server on linux mainly consists of three short steps: install the NFS package, then configure (or in another words export) the NFS shares and lastly set the built-in firewall to allow incoming NFS queries ... Read More
Is Office365 still asking for 2FA for your global admin, even though MFA is disabled for all of your users?
This is because 'Security defaults' are enabled in your tenant. To disable it open the Azure portal: https://aad.portal.azure.com Under 'Azure Active ... Read More
This is because 'Security defaults' are enabled in your tenant. To disable it open the Azure portal: https://aad.portal.azure.com Under 'Azure Active ... Read More
ADFS Smart Lockout handles authentication requests, blocking users when getting suspicious activities from certain IP addresses, while allowing valid users continue to use their accounts. Doing this without locking the actual AD user account ... Read More
