Disable all E-Mail Notifications

Usually you can turn off alerting prior to shutdown and after startup you can let things settle before turning it back on.

Since you have already shutdown it may not be so easy.  

Are you building new servers and attaching to your 'old' database? I am hoping to do the same. I am planning on firewalling everything off except the ports SW needs. You could block off the SMTP port at the firewall temporarily if you have one in place. 

That's exactly what I will be doing. We do have firewalls in place. I was hoping for a DB query where I can just provide a fake SMTP relay server so e-mails don't get sent out.

If you are doing a new install you could manually shut the SMTP service down prior to the installation. I can't remember is SW had their own or they used the one built in Windows. Mine's not up to take a look at the moment. Other option would be have your mail admin blacklist the Orion server's IP's during your install. 

arnabmk an option you might be able to try is to set the value for Enabled to False for all the Actions from the "Actions" table 

I had to do this on my system when I brought it back up. SO the table you need is called DBO.SMTP Servers if you attach with SQL Studio you can use this query to view it. Fill in YOURDATABASENAME with the correct info below.

SELECT TOP (1) [SMTPServerID]
,[BackupServerID]
,[Address]
,[Port]
,[CredentialID]
,[IsDefault]
,[EnabledSSL]
FROM [YOURDATABASENAME].[dbo].[SMTPServers]

That will show your existing SMTP Server Name. To change it to a bogus name, or any other name run this query.

Fill in the data in all caps to your systems correct info.

Use YOURDATABASENAME
GO
UPDATE SMTPServers
SET Address = 'YOURBOGUSSMTPSERVERNAME'
WHERE SMTPServerID = 1;

Runt the first query again once you are done to verify your change took.

Sorry for the delayed response my system was out of service for a while.