Make Sure the Events Are Firing
The first thing to do is to make sure that Spira or KronoDesk is actually sending emails.
To do this, go to the Administration > Email Configuration page in the appropriate application and use the option to send a test message. If you are an end-user, you can also use the Email button for a specific artifact in Spira to send an email to yourself.
When you do this, try different email providers (e.g. Office 365, Gmail, company email) and check the event log in Spira or KronoDesk to see if any errors were logged.
If an error is logged, you may want to contact Inflectra support and provide the email message to make sure.
Make Sure the Mail Server is Whitelisted
If the email is sent, check to see if it appears in your Spam/Junk folder. Sometimes a mail server will reject the email outright, or put it in the Spam/Junk folder.
If you are hosting Spira or KronoDesk on-premise you will need to check that the application is sending the email from a clean IP address and that common settings for identifying valid emails are setup:
If those are all setup, then use a tool like MX Toolbox to check if the IP address or email domain being sent FROM is blacklisted:
If those all appear clean, then the final stage is to submit the IP address being sent FROM to the specific provider: