What's the limit of bcc emails i can send without being marked as spam?

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What's the limit of bcc emails i can send without being marked as spam?

Jebby 3 20

Hi

I want to send out aprox. 300 emails in bcc in total.

What's the recommended number of email addresses in bcc per send, to avoid being marked as spam please?

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Answer 1

Marcin Policht 109.5K MVP Volunteer Moderator

To avoid your email being marked as spam or your account being temporarily restricted, you should consider limiting your BCC field to about 50 recipients per message.

Although Outlook has a maximum technical limit of 500 recipients per message, putting too many recipients in BCC mimics spammer behavior and is likely to triggers automatic filtering.

More at https://support.microsoft.com/en-us/outlook/sending-limits-in-outlook-com

If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

hth

Marcin

Jebby 3 20 Reputation points

2026-06-24T19:22:40.8866667+00:00

Thanks Marcin, i appreciate it. Is there a recommended limit per day at all to avoid being marked as spam?
Marcin Policht 109.5K Reputation points MVP Volunteer Moderator

2026-06-25T00:15:21.3966667+00:00
Yep - as per https://support.microsoft.com/en-us/outlook/sending-limits-in-outlook-com

The limits for Microsoft 365 subscribers are:

Daily recipients: 5,000

Note

Limits may vary based on usage history and will be lower for non-subscribers.

A “non-relationship recipient” is someone you've never sent email to before.

The sending limits of any third party connected accounts depend upon the service provider.

If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

hth

Marcin
Jebby 3 20 Reputation points

2026-06-25T00:17:28.1833333+00:00

ah yeh ok gotcha. Thank you very much Marcin.