Extended Configuration of Microsoft Mailservers

Exchange Online (Microsoft 365)
In this article, we explain how to whitelist Exchange Online (Microsoft 365).    The following steps are required:  1. First, you set up an IP perm...
Thu, 3 Mar, 2022 at 10:22 AM
Exchange on Premise (Exchange Server 2019)
In this article, we explain how to whitelist Exchange on Premise (Exchange Server 2013/2016/2019). The following steps are required: First, you set up an...
Fri, 5 Mar, 2021 at 4:13 PM
Whitelisting Envelope Sender Addresses - Exchange Online (Microsoft 365)
Depending on your setup it might not be sufficient to only whitelist the IPs. In this case you can also whitelist the envelope sender addresses which are di...
Thu, 25 Nov, 2021 at 10:25 AM