We have Skype for Business configured via O365 so can’t use SIP (Or can we?), a MailRelay which fell below the send limit today so couldn’t send alert and questions have been asked about how we’re monitoring mailrelay when it can’t send the alerts to us.
I know we should look at the SquaredUp Dashboards, but we’re still getting used to them…and a Real-Time alert – of sorts – would be nice…
You can add two SMTP servers / relays within a channel:
I’m not sure how smart this is, whether it will be able to tell if one is failing due to availability or due to circumstances like yours, though this should give you an option provided you’re happy to have another SMTP relay 🙂