How can I whitelist the AuthSMTP network on a Microsoft Exchange server?

To whitelist the AuthSMTP network on a Microsoft Exchange server, take the following steps.

Login to your Exchange admin portal
Click 'Admin'
Go to 'Admin Centers' in the left-hand navigation
Click 'Exchange'
Under the 'Protection' section, click 'Connection Filter'
Click on the pencil icon to edit the 'Default' policy
Click 'Connection Filtering' in the left-hand menu
Click the plus '+' symbol to add an IP range
Repeat that step for all IP addresses in the link below
Click 'Save'

Microsoft Exchange does not support whitelisting of large CIDR ranges so you will need to add each of the CIDR ranges from our SPF record.

For a list of the CIDR ranges to use, please see Whitelist using the CIDR ranges from the AuthSMTP SPF record on the How can I whitelist AuthSMTP's network? page.

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