my outlook account will not send emails to multiple addresses using BCC.

Steve Cox 0 Reputation points
2026-11-10T15:44:24.8366667+00:00

my outlook account will not send emails to multiple addresses using BCC. I send messages regularly to members. I am not allowed to show the email addresses due to GDPR. The messages just bounce back undelivered. Is there a solution please.

Outlook | Windows | Classic Outlook for Windows | For home
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  1. Ian-T 16,460 Reputation points Microsoft External Staff Moderator
    2026-11-10T23:51:44.85+00:00

    Hi @Steve Cox

    I understand why you need to keep members’ addresses private. BCC recipients still count toward Outlook’s sending limits, and messages sent to a large BCC list may be blocked by anti-spam protection.

    Please try sending to a much smaller group and space the messages apart. Also check the exact error code in the undeliverable message, as it should indicate whether the cause is a sending limit, an invalid address, a full mailbox, or spam filtering.

    For regular member mailings, Word mail merge or a dedicated mailing-list service may be more suitable because each recipient receives an individual message without seeing anyone else’s address,

    Hope this helps. Have a nice day!

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