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

Jebby 3 20 Reputation points
2026-06-24T19:05:36.5733333+00:00

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?

Outlook | Windows | Classic Outlook for Windows | For home
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Answer accepted by question author
Marcin Policht 109.4K Reputation points MVP Volunteer Moderator
2026-06-24T19:14:46.34+00:00

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

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hth

Marcin

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