I have a web applications that uses the SMPT server on the webserver to send out email notifications to people outside of our network as well as to people inside our network. This has worked for several years, but suddenly, it has stopped working for mail recipients inside our network.
1) the undelivered messages are stuck in the queue on the webserver (Intepub/mailroot/queue)
2) The message I see in the BadMail folder is "Unable to deliver message to the following recipients, due to being unable to connect successfully to the destination mail server."
I need help to get this to start working again. And, I'm a novice at this.