如果邮件一直持续性被alert 或者block, 代理商又不管不问，我们应该如何处理？

TXT、MX、SPF、DMARC、DKIM 是完全匹配，没有问题。

Hi,

Based on Microsoft’s official design and security controls, Microsoft 365 user mailboxes (including those on Business Basic licenses) are not intended or supported for bulk or high‑volume email sending, even when the emails are legitimate and business‑related.

Microsoft’s outbound protection system will continue to automatically restrict mailboxes when high‑volume external sending patterns are detected, and exemption or allow policies do not override these protections.

To provide more clarity, below are the key Microsoft 365 limits that apply to standard user mailboxes:

-Maximum recipients per day (internal + external): approximately 10,000 recipients per mailbox

-Message submission rate: approximately 30 messages per minute

-Maximum recipients per single message: 500 recipients (To, CC, and BCC combined)

-Repetitive or bulk external sending patterns significantly increase the risk of automatic blocking, even if the numeric limits above are not obviously exceeded

Once Microsoft detects abnormal outbound behaviour (for example, bursts of emails to many external recipients), the mailbox can be temporarily restricted automatically as a protective measure.

We have reviewed Microsoft’s official guidance and technical recommendations. Unfortunately, there is no permanent fix within Microsoft 365 that would allow high‑volume bulk external email sending from user mailboxes without recurring blocks.

While Microsoft offers High Volume Email (HVE), this service is limited to sending emails to internal recipients within your Microsoft 365 tenant only. It does not support bulk email delivery to external recipients (customers, vendors, or partners), and therefore does not meet your stated business requirement.

Given that your business relies heavily on sending large volumes of emails externally, Microsoft strongly recommends using a dedicated third‑party bulk email service. 

These platforms are built specifically for high‑volume outbound email and provide proper sender reputation management, unsubscribe handling, compliance controls, and stable delivery without impacting your Microsoft 365 tenant or user mailboxes.

Continuing bulk external email activity from Microsoft 365 user mailboxes will result in repeated sending restrictions, regardless of licensing level or policy adjustments.

We therefore strongly recommend planning a migration of bulk external email sending to a supported third‑party service to prevent ongoing service disruptions.

以上是他们的官方回复。请问如果一个邮件能收发10000邮件，而我们的邮件都不能达到400，这就“bulk email”了嘛？ 我们在没有任何违反规则的情况下一只被block ,然后你们的解决方法就是让我们去买第三方邮件？我们物流行业，一天400-500封邮件是正常的业务方位，而且我们会附带一些文件，比如shipping docs/invoice/bl 等等。 我们并没有要去blaste email for marketing。 如果这么简单的要求都不能满足，那Mirosoft 如何说是最好的邮件服务商呢?