smtp server that nagios uses

[Melanie Pfefer]

the machine where nagios is installed uses postfix as smtp. I know this might be off-topic, but any idea where to look so that I verify to which server postfix relays the email?

actually we upgraded our exchange mail server and we want to shutdown the old one. My worries is that nagios (now I understand it is postfix) still points to the the old mail server 

PS: How to determine which mail server my DNS uses?

thx


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