Do messages get emailed automatically if daily message limit for outbound emails exceeds a certain number?

Question

We are currently to trying to adjust the daily message limit for outbound spam policy within Defender. Our current policy is set to the options pictured attached.

Our concern is communication, especially emergency communication, to members and providers. There are contractual requirements of notification from our state whereas an option, our company decides to send out email to all members.  If someone were attempting to send 20,000 emails to our members, does the rest of the 10,000 emails that were not able to be sent get put on a queue until the next day, then it continues to send automatically?

Additionally, is this policy reflecting recipients or email count? Is there an option to let the user(not admin) know that they exceeded their limit?

Answer 1

Hello Marcos correa,

Thank you for your question.
If someone attempts to send 20,000 emails, the remaining 10,000 emails that exceed the limit will not be queued for the next day. Instead, they will be blocked, and the sender will need to resend them the following day since the policy reflects the number of recipients, not the email count. This means that the limit is based on the number of unique recipients that can receive emails from a single sender in a day.
After the recipient rate limit is reached, messages can't be sent from the mailbox until the number of recipients that were sent messages in the past 24 hours drops below the limit. For example, a user sends an email message to 5000 recipients at 09:00 AM, then sends another message to 2500 recipients at 10:00 AM, and then sends another message to 2500 recipients at 11:00 AM, hitting the limit of 10,000 messages. The user won't be able to send messages again until 09:00 AM the next day.
Reference the Sending limits doc .

There is also no direct way to notify the user that they exceeded their limit. However, administrators can try and configure alert policies to notify them when the sending limit is exceeded.

I hope this helps to answer your question. If you find the answer above helpful, please Accept the answer to help anyone in the community who might have a similar question to quickly find the solution.