Currently there is no way to configure this in VirtualCenter. You can’t specify a custom port and you can’t use SSL and authentication for SMTP. What you will have to do as a workaround is send alarms using SNMP forwarding to a system that can receive them and then send an email. You can also try setting up a SMTP forwarder using IIS where you can send the alerts to from your VC server on port 25 which could then forward them using SSL to your email servers.
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