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Create a domain or user-based safe sender or blocked sender list using transport rules

Exchange 2013
 

Applies to: Exchange Online Protection, Exchange Online

Topic Last Modified: 2014-09-12

If you want to be sure that you receive mail from a particular sender, because you trust them and their messages, you can create an Exchange transport rule that serves as a domain or user-based safe sender list. Any messages sent from the domain or user you specify bypasses spam filtering.

Conversely, if you want to block messages sent from a particular domain or user, you can create an Exchange transport rule that serves as a domain or user-based blocked sender list. Any messages sent from the domain or user you specify will be blocked.

TipTip:
A domain-based list isn’t as secure as an IP address-based list, because domains can be spoofed. Also, if the sending IP address is on a Block list, it will still be blocked even if filtering for the domain or user is being bypassed. This is because a transport rule on a domain or user does not override the global IP Block list. We recommend using an IP address-based list in most cases. To create an IP address-based list, you can use the IP Allow list or IP Block list in the connection filter. Any messages sent from these IP addresses aren’t checked by the content filter. For instructions on how to configure the connection filter policy by adding IP addresses to the IP Allow list or IP Block list, see Configure the Connection Filter Policy.

For additional management tasks related to transport rules, see Transport rules.

TipTip:
Having problems? Ask for help in the Exchange forums. Visit the forums at: Exchange Server, Exchange Online, or Exchange Online Protection.

  1. In the EAC, navigate to Mail flow > Rules. Choose Add Add Icon and then choose Bypass spam filtering.

  2. Give the rule a name. Under Apply this rule if, choose The sender and then select one of the following conditions:

    • If you want to specify a domain, choose domain is. In the Specify domain dialog box, enter the domain of the sender you want to designate as safe, such as contoso.com. Add Add Icon to move it to the list of phrases. Repeat this step if you want to add additional domains, and click OK when you are finished.

    • If you want to specify a user, choose is this person. In the Select members dialog box, add the user from the list or type the user and click Check names. Repeat this step if you want to add additional users, and click OK when you are finished.

  3. Select the Stop processing more rules check box to ensure that no other rule can reverse the bypass action

  4. For the Match sender address in message option, select Header or envelope.

  5. If you’d like, you can make selections to audit the rule, test the rule, activate the rule during a specific time period, and other selections. We recommend testing the rule for a period of time before enforcing it in your organization. For more information about these selections, see Manage Transport Rules.

  6. Choose Save to save the rule.

After you create and enforce the rule, spam filtering is bypassed for the domain or user you specified.

  1. In the EAC, navigate to Mail flow > Rules. Choose Add Add Icon and then choose Create a new rule.

  2. Give the rule a name and then click More options.

  3. Under Apply this rule if, choose The sender and then select one of the following conditions:

    • If you want to specify a domain, choose domain is. In the Specify domain dialog box, enter the sender domain from which you want to block messages, such as contoso.com. Click Add Add Icon to move it to the list of phrases. Repeat this step if you want to add additional domains, and click OK when you are finished.

    • If you want to specify a user, choose is this person. In the Select members dialog box, add the user from the list or type the user and click Check names. Repeat this step if you want to add additional users, and click OK when you are finished.

  4. Under Do the following, choose Block the message and then click one of the other options such as Delete the message without notifying anyone.

  5. Click More options, and then for the Match sender address in message option, select Header or envelope.

  6. If you’d like, you can make selections to audit the rule, test the rule, activate the rule during a specific time period, and other selections. We recommend testing the rule for a period of time before enforcing it in your organization. For more information about these selections, see Manage Transport Rules.

  7. Choose Save to save the rule.

After you create and enforce the rule, any messages sent from the domain or user you specify will be blocked.

 
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