Microsoft Online Exchange 365 giving NDR issues ??

Are your using Microsoft exchange 365 online ? If the answer to that is yes.. Please read bellow.

Users facing have been informing IT support that they are getting Non-delivery-Report (NDR) for some e-mails that they have sent.

Enabling second interface on the server without physically connecting the cable "Big Mistake"

Warning : Kids Please don't try this on any server without having physical connectivity to it,,, cuz this is a disaster waiting to happen.

This caution has been written after one such incident happened and it really was not fun to debug especially if someone from the team has done this and not informed anyone.

The server on which this was done unfortunately was the Exchange, DNS, and VPN server. After the second interface was enabled there was loss in VPN connectivity. Exchange was also giving problem's :(

IT Gone BAD.. The UP's and DOWN's (A System Adminstrator's real nightmare)

There are a very few senario's in which IT infrastructure can get really messed up

You make sure you have all the right things in place so that your Domain server does not go down, But no matter how much you try and cry incidents do happen.

like Senario 1 :-

You have a domain controller machine with Exchange running to protect the machine you have connected a RAID card and attached 4 drives, so that even if 1 drive fails the other drive can take over. How can this server still fail ?

Ans - RAID card crashes

(due to the raid card crash, to your bad luck even the exchange databases get corrupt... and you keep crying why me ? )

1) The domain controller is the most important system in the network, hence it was raided with 4 drives (now how the hell would anyone expect a server with 4 raid drives ever hope the server would crash ?), Let me tell you how, to our bad luck the RAID card crashed, Server went down, exchange databases got corrupt, the only good part was that the exchange database was being backed up, but the weekly exchange was failing.... BAAP RE... now wht ?? Luckly we got the support contract renewed with symantec.. guided us to somehow recover the databases.

Senario 2 :-