Problem statement
Information on how to monitor for STMP issues.
Solution
When an SMTP error occurs it will trigger an fn event. This event code refers to Failed Sending Notification as documented here: Log Event Type Codes .
Include such events in log streams as the log type fn falls under User/Behavioral - Failure: See User Behavior Failure codes.
To do this set up a log stream. Refer to Log Streams documentation for information on how to do this.
After configuring the log stream, filter for User/Behavioral - Failure events to ensure that fn events are included (User Behavior Failure ).
It’s currently not possible to filter for only a specific event code (fn in this case), only one or more of the categories of events listed here: Log Stream Filters
To filter for only fn events this must be done on the log service side.