Our environment has Postfix as satellite (relay) on Opsview Core (Ubuntu) and a Microsoft Exchange 2010.
The notifications have been working for two years, without issues. Suddenly, in last month, our Opsview stop to send notifications by e-mail.
I've checked our postfix configuration, Exchange Server configuration, contacts in Opsview. Everything seems right, without find any mistake.
In CLI, I'm able to send test emails (via telnet on my Exchange Server).
Is there anything that I can search for mistake configuration ?