Forum Discussion
Mailbox blocked daily
I have a mailbox which sends automatically confirmations to customers about their bookings. Each day this account is blocked by the security system and should be released manually from Security porta...
Can you find the exact reason the mailbox is being blocked in Defender? It may be because it's exceeding some limits (check your outbound anti-spam policy). Generally Microsoft limit outgoing mail to protect both the service and their sending reputation. They recommend using third party services for bulk mail if it exceeds the limits.