Outlook / Hotmail / Microsoft mailboxes rejected

If you're having issues with emails not reaching Microsoft MyBox, you can request assistance directly from your provider. This situation often arises if you are using a new IP address or one that hasn't been used in a while. When you start sending emails from such an IP, Microsoft often blocks the messages, especially if you send more than 150 emails at once. To avoid this, as soon as you notice errors, contact support immediately to have the limit removed or increased.



the error looks something like this

550 5.4.1 Recipient address rejected: Access denied. [AMS1EPF0000004E.eurprd04.prod.outlook.com XXXX-07-07: