I can't send you an email.

Question

No emails have been sent since more than 600 spam emails came in a day on Wednesday night, January 26.

I changed my password and strengthened security, but why can't I send an email?

No e-mail is sent and spam is sent.

Please solve this problem.

Answer 1

Hi, please contact your IT Admins, your account has been blocked by Exchange Online. No one here can fix this.
You own Admins however can remove the block.

Your admins will need to go here to remove the block:
https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/removing-user-from-restricted-users-portal-after-spam?view=o365-worldwide

Answer 2

If the list of restricted users is empty but the user’s emails are still blocked, it may mean that the default outbound spam policy in the Microsoft 365 Defender admin center comes into play, locking the user who exceeds its message count limit out. The admin can increase global message limits to appropriate value(s) that will prevent the user from being blocked. But setting limits too high may cause your domain to be blacklisted and lose reputation for sending too many emails.

1. Open the Anti-spam policies page by clicking this link
2. Select Anti-spam outbound policy (Default).
3. In the pane that opens, click Edit protection settings
4. Enter a higher value of external, internal, or daily message limit, depending on which one applies to the affected (restricted) user. The maximum value for each field is 10000.

Please check if this can solve your issue.

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