Queue SMTP Emails when SMTP Server is Unavailable

There are various scenarios in Maximo where email is sent explicitly from the various MXServer.sendEmail() methods. For example, the PM WOGEN cron task. If the email fails to send to the SMTP server (such as the SMTP server is down) it's gone forever. Depending on what tried to send the email would determine whether or not you see the error, but regardless, the email itself is not recoverable.

Emails can sometimes contain important information and customers shouldn't have to setup local relays to try and avoid cloud outages that may occur that would cause email to be lost. There is some functionality on communication templates for tracking failed emails, but we think a better solution would be to queue outbound emails for processing. We know there might be other email methods outside of MXServer.sendEmail where Maximo might create an explicit SMTP connection, but most scenarios (including communication templates) use the MXServer.sendEmail methods and simply addressing at that level would greatly improve reliability of email delivery.

Utilizing something like JMS/Kafka queues either to send all emails (which could then get processed via EJB) or track when emails failed to then reprocess seem like it'd be a net win. There is some functionality with email listener (for inbound emails) to utilize JMS as well. Adding one for outbound processing of emails would help ensure email messages are never lost.