Enhancing Email Security: Opportunistic TLS and Encryption Solutions In Part 1 of this series, we explored how SMTP DANE and DNSSEC collaborate to secure email communications in Exchange Online, ensuring authenticity and encryption between servers. In this follow-up, we focus on two critical components of email security: Opportunistic TLS and email encryption. Specifically, we’ll examine …
Issue Overview A customer faced a problem where all new users created in the past week and newly added proxy addresses failed to receive emails from external senders due to Directory-Based Edge Blocking causing 550 5.4.1 NDR. Internal emails worked fine, but external messages were rejected with the error: 550 5.4.1 [user@Customerdomain.com]: Recipient address rejected: …
Sometimes you find yourself in a situation, where you need to change the assigned Region or Vnet on a VM in Azure. There is a very simple and fast way of achieving this. By deleting the server, and assigning the same virtual disk to a new VM connected to the correct Vnet. Go to the …
