Why do you keep blocking my group emails and calling it spam when it is not?

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Why do you keep blocking my group emails and calling it spam when it is not?

Robert Taylor 20

Outlook keeps blocking my group emails and calling them spam when they are not spam.

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Answer 1

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If your group emails are being blocked and marked as spam in Outlook, it may be due to the default settings of Microsoft 365 groups, which typically do not allow emails from external addresses. This means that if your group is receiving emails from a mail-enabled security group, such as '******@sharepointonline.com', it could be treated as external and subsequently blocked.

To resolve this issue, you can change the settings of your Microsoft 365 group to allow emails from external senders. Here’s how you can do that:

Open the Microsoft 365 admin center.
Select Group > Active groups.
Search for and select the group whose settings you want to change.
Select the Settings tab.
Under General settings, select Allow external senders to email this group.
Select Save.

This adjustment should help ensure that your group emails are not blocked as spam in the future.

References:

Notifications sent to SharePoint sites connected to Microsoft 365 groups aren’t received

Robert Taylor 20 Reputation points

2026-02-10T21:27:30.58+00:00

I don't use Microsoft 365. Just Outlook
Robert Taylor 20 Reputation points

2026-02-10T21:29:30.9766667+00:00

I don't use Microsoft 365. Just Outlook.

Answer 2

Teddie-D 12,580 Microsoft External Staff Moderator

Hi @Robert Taylor

Thank you for posting your question in the Microsoft Q&A forum.

To help narrow down the issue, could you provide a bit more detail about your setup?

-Are you signing in with a personal Microsoft account (for example, @outlook.com or @hotmail.com) or with a work/school account?

-What type of account is configured in Outlook (POP, IMAP, or Exchange)?

-When you mention "group emails," do you mean sending a single message to multiple recipients at the same time? Approximately how many emails are you trying to send at once?

-What specific error message or bounce‑back notice do you see when the emails fail to send?

Please know that while our initial response might not resolve the issue right away, your input is incredibly valuable. With a bit more detail, we’ll work together to find the best solution for you.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Austin-H 8,180 Reputation points Microsoft External Staff Moderator

2026-02-12T03:22:33.6866667+00:00

Hi @Robert Taylor
Is there any update from you?

If you need further help, please provide more detailed information so that we can offer more accurate suggestions.
Robert Taylor 20 Reputation points

2026-02-12T03:53:14.3266667+00:00

I am signing in with a business microsoft account @outlook.com

I believe it is a pop account, it is not exchange.

Group emails are to a Lions club with 72 members on the list.

It is a single message to 72 members.

I get an immediate bounce back of 2 emails. One from system administrator saying undeliverable with all members listed.

The Second is from the "Outlook Team" Says: Hello <Moderator note: PII Removed>,

The daily message limit helps us free the world from spammers--we're sorry that it's getting in your way.

Thanks, The Outlook.com Team
Austin-H 8,180 Reputation points Microsoft External Staff Moderator

2026-02-12T05:16:15.48+00:00

Hi @Robert Taylor
Thank you for the additional information.

Based on the bounce message from the Outlook Team referencing the daily message limit, this issue is not related to Outlook Classic’s Junk Email filter or POP configuration.

The message is being rejected by Outlook.com’s server-side outbound protection system before delivery. Outlook.com enforces adaptive sending and recipient limits to prevent spam and bulk abuse. These limits are not based solely on the number of emails sent, but also on:

-Total recipients within a 24-hour period

-Account sending history and reputation

-Relationship history with recipients

-Bulk-sending patterns

-Previous bounces or complaints

Even a single message sent to 72 recipients can trigger this protection if the activity is considered bulk or atypical for the account.

“The daily message limit helps us free the world from spammers…” confirms this is an automated Outlook.com sending restriction and not a client-side Outlook issue. This restriction is often temporary and may clear automatically after a period of reduced sending activity. If this type of communication is recurring, it is recommended to:

-Send in smaller batches

-Use BCC instead of placing all recipients in the To/CC fields

-Consider using a mailing list service designed for bulk distribution

To better understand why the sending limit was triggered, could you please confirm:

-Is this a relatively new Outlook.com account?

-Has this type of sending restriction occurred previously?

Outlook.com applies adaptive sending limits based on account age, sending history, and reputation. This information will help determine whether the restriction is due to bulk detection behavior or account reputation factors.
Robert Taylor 20 Reputation points

2026-02-12T14:19:02.99+00:00

It is a relatively new account and it has always happened.
Austin-H 8,180 Reputation points Microsoft External Staff Moderator

2026-02-13T02:01:58.55+00:00

Hi @Robert Taylor
Thank you for your response.
Since this is a relatively new Outlook.com account and the restriction has consistently occurred, this behavior aligns with Outlook.com’s adaptive outbound protection for new accounts. New accounts are typically subject to stricter sending thresholds while reputation is being established. Sending a message to 72 recipients at once is likely exceeding the account’s current recipient limits or triggering bulk-sending detection. If bulk communication to large groups is a regular requirement, using a mailing list service or a business-class email solution designed for distribution is recommended.

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Why do you keep blocking my group emails and calling it spam when it is not?

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