If you accidentally deleted Postfix log files in Ubuntu (or any other system), you can restore them in the following way:

How to find all mailboxes in Exchange 2010/2013 with mail forwarding enabled?

It's just a string in Powersehll:

It's no secret that when you perform backup with Veeam Backup & Replication, sometimes it "forgets" to delete the its snapshots. This leads to the fact that all virtual machine starts to work entirely on snapshot all the time. This is a costly operation, which significantly reduces the performance of the virtual machine.

In addition, system administrators can create snapshot manually and forget about it. We had a case in our company when a virtual server half-year (!!!!!) worked on the snapshot.

Fortunately, VmWare provides a plugin for Powershell, PowerCLI, which you can use to find all these snapshots.

The longer you work with Veeam Backup & Replication, the lower and lower its interface work. Apparently, this is because Veeam stores in database information about all sessions of the interface. Once they become so numerous that queries to the database begin to slow down.

So we need:

1. Set up Veeam to not to store all this unneeded information.
2. Delete existing data from database.
3. Truncate and shrink database.

After performing these steps, my Veeam client started to work much faster.

Exchange 2010 and 2013 partially managed with Exchange Control Panel (ECP). It's a web-service running on IIS on Client Access Server. There is a problem: when you publish OWA in the Internet, you automatically publish ECP to the Internet too. And this is a security issue.

If you use IIS ARR as Reverse Proxy for publishing Exchange to the Internet, you can create rule that will block access to URLs like https://owa.domain.com/ecp/.

Recently MDaemon that installed on Windows Server 2003, ceased to send or receive messages from\to some mail servers. As it turned out, the problem is in the obsolete SSL\TLS protocols on Windows Server 2003.

Symptoms (cut from log):