send bulk emails in office 365 for a campaign

eg1995 1,131 Reputation points

hi team,

I have a campaign to send bulk emails for recipients using Office 365. ( Thousands per hour/day). Can i know what is my limit before the user get blocked?

and if the user is blocked and i went and unblock it, will I be entitled to send again automatically or i have to wait for some time? and will the same user be blocked again if I am sending bulk emails.

Microsoft Exchange Online
Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Vasil Michev 96,436 Reputation points MVP

    Don't. While the Exchange Online limits allow for up to 10000 recipients per day, that does not apply to bulk scenarios. Not only the user(s) will be blocked, you risk your entire tenant's mail flow being restricted. Use a tool that specializes in marketing/bulk campaigns instead.

    4 people found this answer helpful.

  2. Yuki Sun-MSFT 40,871 Reputation points

    Hi @eg1995

    Totally agree with both Vasil and Ash that it's not recommended to send bulk emails from Office 365. Below is some more information from official blog for reference:

    Microsoft does not recommend sending bulk messages from Office 365, as organizations are often blocked for exceeding the allowed limit (see Exchange Online limits). Instead, send bulk email through on-premises email servers or use a third-party bulk email provider, which normally has a vested interest in working with customers to ensure good email sending practices. To learn more about outbound spam controls, see Outbound spam protection in EOP.

    Original article: Email Protection Basics in Microsoft 365: Bulk Email

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    1 person found this answer helpful.
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