Managing personal Outlook.com account settings, security, and privacy
Welcome Unity_Rolling,
Thank you for posting your question.
The error message usually means that Outlook.com has temporarily limited sending activity to help prevent spam. Even if you have completed the security verification.
Before suggesting further troubleshooting, could you please confirm:
- Is this an Outlook.com/Hotmail/Live/MSN personal account, or is it a Microsoft 365 work/school account?
- Are you sending to all 30 recipients in a single message, or are you using a distribution/group list?
- Approximately how many emails have you sent from this account during the last 24 hours?
Looking forward to your update.