When using EmailMerge365, you may sometimes see a warning that Microsoft has temporarily throttled your account and EmailMerge365 needs to wait before sending again.

This usually happens when sending emails with large attachments.

Why This Happens

Microsoft may temporarily slow down or pause sending if too much data is being sent in a short time. Large attachments are the most common cause.

If you are sending the same attachment to all recipients, a better option is to upload the file to OneDrive and send it as a link instead of attaching the file directly.

This reduces the email size and helps avoid throttling or timeout errors.

Recommended Solution: Change Attachments to OneDrive Links

1. Attach your file as normal (if it is not already attached to the email).
2. Click the down arrow next to the attachment.
3. Select Upload to OneDrive.

Outlook will upload the file and replace the attachment with a sharing link. The file will now appear as a friendly link in your email instead of a large attachment.

You can also right-click the link if you want to change the sharing permissions or copy the full link.

Additional Tips

To reduce the chance of throttling errors:

• Avoid sending very large attachments
• Use OneDrive links whenever possible
• Send smaller batches if emailing a very large recipient list
• Wait a few minutes before retrying if throttling occurs

Summary

Using OneDrive links instead of large attachments is the easiest and most effective way to reduce Microsoft throttling and timeout warnings when using EmailMerge365.