Bulk Email Information

Question

Bulk Email Information

Avinash 115

Hi Team,

Good day!

I hope this email finds you well. We have some concerns regarding bulk email sending from our configured email address. Recently, when we attempted to send bulk emails using Outlook, our emails were flagged and not delivered, resulting in our email address being quarantined. We provided this email address for our client, and we cannot afford to face this issue again.

We have a few questions:

We have created a plan for our project to divide 100 emails into three blocks for sending to the recipients.
We want to avoid any misunderstandings, so could you please help us determine how many emails we can send using Mail Merge in MS Word for this process?
We would like to ensure that we do not encounter any further issues with blocking from the same email address, as this is a key email address for us.

We kindly request the team’s assistance with this information, as it would be very helpful to us.

2 answers

Your answer

Answer 1

Dear @Avinash,

Welcome to the Q&A Community.

Thank you for sharing your concerns. We understand how critical it is for you to maintain the reliability and reputation of your email address, especially when it's used for client communications. Based on your plan to use Mail Merge with Word and Outlook, here are key recommendations to help ensure smooth delivery and avoid issues like quarantining or blocking:

1/ Sending Limits: Microsoft 365 allows up to 10,000 recipients per day and 30 messages per minute. Mail Merge sends each email individually, so the per-message recipient limit doesn’t apply.
2/ Smart Strategy: Splitting your 100 emails into smaller batches is a great approach to stay within safe limits and reduce the risk of triggering spam filters. To learn more, please consult the following resources:

Exchange Online limits - Service Descriptions | Microsoft Learn

Sending limits in Outlook.com - Microsoft Support
3/ Mail Merge Tips: Use HTML format for better formatting and deliverability. Note that CC/BCC and attachments aren’t supported, consider using links or compressing the attachment into formats like .ZIP, .RAR, or .7Z, with .ZIP being the most recommended for file sharing.

This article provides further guidance on the topic:

Use mail merge in Word to send bulk email messages - Microsoft Support
4/ Authentication: Ensure your domain has valid SPF, DKIM, and DMARC records to protect your email reputation. Regularly clean your mailing list and include an unsubscribe option. You may find these articles helpful for further details:

Set up SPF identify valid email sources for your Microsoft 365 domain - Microsoft Defender for Office 365 | Microsoft Learn

How to use DKIM for email in your custom domain - Microsoft Defender for Office 365 | Microsoft Learn

Use DMARC to validate email, setup steps - Microsoft Defender for Office 365 | Microsoft Learn

You may also find this resource helpful for a comprehensive guide on setting up SPF, DKIM, and DMARC DNS records in Microsoft 365:

Setup Microsoft 365 DMARC, DKIM, SPF for Domain Authentication | DmarcDkim.com

I hope this helps clarify things for you. If you need any further assistance or clarification, feel free to reach out. We're here to help. Thank you very much for your understanding and your cooperation.

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Ruby-N 1,750 Reputation points Microsoft External Staff Moderator

2025-08-20T18:04:25.7533333+00:00

Good day @Avinash,

Hope things are running smoothly on your end.

Following up on the support thread we've been working on. I hope the information I shared in my previous answer resolve the issue you were facing. If you are still facing the same issue or need assistance with anything else, kindly respond to this email, and I will be happy to help.

We want to make sure everything is working as expected and that your experience remains uninterrupted.

Thank you for your patience and understanding throughout the troubleshooting process.

I look forward to hearing from you soon.

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Answer 2

Hello @Avinash,

I hope you're having a good week so far.

I'm reaching out again to follow up on your issue and check if everything has been resolved. My goal is to ensure your experience remains smooth and hassle-free. If you're still encountering any problems or have run into new challenges, please let me know which steps you're currently stuck on and happy to provide further help whenever you need it.

If you have any further questions, feel free to tag me in your reply so I can assist you directly.

Looking forward to your update.

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Bulk Email Information

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