Web search results for query: "MailProtector email filtering IP addresses whitelist exchange connector 2025"

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Based on the search results, here's information about Mailprotector email filtering, IP addresses, whitelisting, and Exchange connector configuration:

## Mailprotector Email Filtering & Exchange Connector Configuration

### Configuring Enhanced Filtering with Exchange Online
One of the steps in the configuration requires adding all the IP addresses used between the sending source and Mailprotector's gateway. The following list of IP addresses needs to be added to the IP addresses to skip list.(no content)In most cases, the inbound connector to Microsoft 365's Exchange Online to secure mail flow from Mailprotector is sufficient. Emails arriving from Mailprotector often fail SPF and DMARC validation performed by Exchange Online Protection (EOP) or Microsoft Defender, but since the inbound connector establishes a trusted connection, this does not create a problem.(no content)If there is a need to also use EOP or Microsoft Defender as a second filter of messages, configuring Enhanced Filtering will be required. The feature provides Microsoft with gateway IP information to properly perform SPF, DKIM, and DMARC evaluations when messages come through Mailprotector first.

### Whitelisting IP Addresses in Mailprotector
Mailprotector's Allow list only accepts valid domains and email addresses. To allow or whitelist an IP address or IP range, a Message Rule must be created. A Message Rule can be added to a domain, user, or reseller level to apply to all domains under management in the Mailprotector Console.(no content)Message Rules do not natively support IP ranges or CIDR (classless inter-domain routing) notation. A range of IP addresses must be added as individual IP addresses, or a CIDR notation can be converted to a regular expression. A regular expression can be built quickly using the CIDR to RegEx builder.

### Firewall Configuration
Before proceeding, please ensure that you have allowed all Mailprotector IP addresses through your firewall. You can find a complete list of them on Mailprotector's support site.

### On-Premise Exchange Configuration
For on-premise Exchange, you will need to modify your firewall to allow the appropriate port into your Exchange server (ideally only from Mailprotector's IPs) and you need to modify your Mailprotector Inbound SMTP Host address accordingly.

### Office 365 Specific Configuration
If using Office 365, the Inbound SMTP Host Address will be the MX record specified in the Office 365 Domain Setup. You can confirm the correct address by following Mailprotector's Cheat Sheet article.

### Best Practice Note
Best practice is not to configure EOP or Microsoft Defender as a secondary email filter. The default settings typically work well. These instructions are a courtesy for those partners and their clients that deem using Microsoft's email filtering in addition to Mailprotector as a necessity.

For the complete list of Mailprotector IP addresses to whitelist, you should visit the Mailprotector Help Center directly, as referenced in their documentation.


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