Is send connectors fault tolerant for source servers?

Hi!
I am in the process of applying SP3 on our Exchange 2010 environment. I have two Hubs that are both specified as source servers in our send connector to the internet. I just want to double check that when I'm applying SP3 to one of the server, that the other
server is taking care of sending all emails.
My fear is that it is only load balancing so every other email will fail to be sent because on of the hubs are down.
So can I safely update one of the servers and mail will be still sent from the other? Or should I just remove it as a source server from the send connector?
I will of course redirect incoming emails to the hub that are up at the moment.
Thanks!

Hi ,
Based on my knowledge while doing service pack upgradation on the hub transport severs there is no need to remove that particular server from source server list on the send connectors.
In addition to that mail flow will load balanced across both the hub transport servers listed on the source server list .So on such case if anyone of the server in send connector's source server list is not funtional for the particular point of time then
it will prefer the second funtional server to send emails to internet.Finally i would like to say that there wouldn't be an loss in emails.
Thanks & Regards S.Nithyanandham

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