For latest updates on HVE, please also see this post.
High Volume Email (HVE) for Microsoft 365 allows customers to send large volumes of email, primarily to internal recipients without any recipie...
Updated May 06, 2025
Version 3.0
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Simone_LiebalThank you very much for your answer. We have a problem with the fact that we have to open port 587 on our firewall to any destination. This is a security problem for us.