Office 365 Activity Alerts don’t seem to be working too well these days. At least, that’s what we found when we tried to create an alert for Teams creation events. Never mind, PowerShell will do the job as we can quickly whip up a PowerShell script to find audit records for team creations and put them into an email.
You can use the Send-MailMessage cmdlet in a PowerShell script to send mail messages via Exchange Online. And sometimes your IP address might be listed as a spammer, which is bad. All in all, authenticated client submission seems best.