i can not send a mass email to less than 50 people?

The “daily limit” notice means the Outlook.com account has reached its current daily-recipient quota, not that one message is limited to 50 recipients; wait for the quota to reset before sending again.

What to do

1. Stop retrying the full Bcc message for now. Every address in To, Cc, and Bcc counts as a recipient. The quota is cumulative across messages sent during the day.
2. After the quota resets, test from Outlook.com on the web:
   • Send a plain message with no attachment to one recipient.
   • If successful, the account can send again.
   • Divide the mailing into smaller groups and spread them out rather than sending all recipients at once.
3. Avoid placing the entire list in Bcc. Large Bcc lists can resemble bulk-email activity. Microsoft specifically recommends not putting all recipients in Bcc and not sending too many messages or recipients at once.^1^
4. Add legitimate recipients to Outlook.com Contacts, particularly people whom you have not emailed before. Outlook.com considers someone you have never emailed a “non-relationship recipient,” and Microsoft recommends adding recipients to Contacts and communicating with them regularly.^2^

Why fewer than 50 can be blocked

For Microsoft 365 subscribers using an Outlook.com mailbox, the documented maximums include 5,000 daily recipients, 500 recipients per message, and 1,000 daily non-relationship recipients. However, Microsoft states that limits vary with usage history, are lower for non-subscribers, and can initially be restricted for new accounts.^2^

Therefore, being under 50 recipients does not guarantee delivery if:

• Earlier messages have already consumed the account’s daily allowance.
• Many addresses are people the account has never emailed.
• The account is new or has limited sending history.
• The pattern resembles bulk sending, especially with all recipients in Bcc.

If it still fails afterward

If a one-recipient message still produces the same daily-limit notice after allowing the quota to reset, open Outlook.com → Help, enter the error text, complete the suggested troubleshooting, then scroll to Still need help? and select Yes to contact Outlook.com support.^3^

For recurring newsletters or promotional mailings, use a dedicated bulk-email service rather than a personal Outlook.com mailbox.

References

1. Sender Support in Outlook.com | Microsoft Support
2. Sending limits in Outlook.com | Microsoft Support
3. Can't send or receive email in Outlook.com | Microsoft Support