In this post, let’s have a look at the error message “5.1.90 – Your message can’t be sent because you’ve reached your daily limit for message recipients” that you get when working with Microsoft 365 Exchange Online.
These are the errors that you usually receive when there is a problem in delivering the email message that was sent by you. These errors are generated and sent by Office 365. This is usually alled as DSN which stands for delivery status notification or in simple words bounce messages.
NDR or Non-delivery report is one of the common type of message that you receive which indicates to the user that the email was not delivered.
5.1.90 – Your message can’t be sent because you’ve reached your daily limit for message recipients
The sender has exceeded the recipient rate limit as described in Sending limits.
This could indicate the account has been compromised and is being used to send spam. For more information, see How to determine whether your account has been compromised.