Anti-Spoofing SPF Based Bypass policies allow 'spoofed' inbound messages through to end users that you consider to be legitimate. This could include emails generated from web servers that hold your domain name, or a trusted third party system that generates emails using an internal email address.
Consider the following before creating a policy:
- Only one Anti-Spoofing SPF Based Bypass policy can apply to a specific mail flow, but it can contain many domains.
Don't enter domains with a “+all” qualifier in their SPF record, and always validate a domain’s SPF records prior to entering it in the policy. See the Sender Policy Framework Project Overview page for more information about qualifiers.
Configuring an Anti-Spoofing SPF Based Bypass Policy
To configure an Anti-Spoofing SPF Based Bypass policy:
- Log on to the Administration Console.
- Click on the Administration menu item. A menu drop down is displayed.
- Click on the Gateway | Policies menu item. The Gateway Policy Editor is displayed
- Click on Anti-Spoofing SPF Based Bypass. A list of policies is displayed.
- Either select the:
- Policy to be changed.
- New Policy button to create a policy.
- Complete the Options section as required:
Option Description Policy Narrative Provide a description for the policy to allow you to easily identify it in the future. Select Option
Select whether to enable or disable the bypass policy. If enabled, none of the Anti-Spoofing policies will be applied if the inbound IP address is referenced on any of the SPF records of the domains specified in the “When IP matches SPF records of” field.
When IP Matches SPF Record of
Specify the domain names whose SPF records should be checked to see if the connecting IP address has been referenced. This acts as a policy condition if an SPF check for the connection IP address results in a “Pass” or “Success” for any of the entered domains. The bypass is then applied if the communication pair matches the policy "from" and "to" configuration.
Set to a value of from "Everyone" to "Everyone" as long as the value entered in the "When IP Matches SPF Record of" field matches the domain.
- Complete the Emails From and Emails To sections as required:
Field / Option Description Addresses Based On Specify the email address characteristics the policy is based on. This option is only available in the "Emails From" section: Option Description Both Applies the policy based on either the Mail Envelope From or the Message Header From, whichever matches. If both match the specified value the Message Header From is used. Applies From / To Specify the Sender characteristics the policy is based on. For multiple policies, you should apply them from the most to least specific. The options are: Option Description Everyone Includes all email users (i.e. internal and external). This option is only available in the "Emails From" section. Internal Address Includes only internal organization addresses. External Address Includes only external organization addresses. This option is only available in the "Emails From" section. Email Domain Enables you to specify a domain name to which this policy is applied. The domain name is entered in the Specifically field. Address Groups Enables you to specify a directory or local group. If this option is selected, click on the Lookup button to select a group from the Profile Group field. Once a group has been selected, you can click on the Show Location field to display the group's path. Address Attributes Enables you to specify a predefined Attribute. The attribute is selected from the Where Attribute drop down list. Once the Attribute is specified, an attribute value must be entered in the Is Equal To field. This can only be used if attributes have been configured for user accounts. Individual Email Address Enables you to specify an SMTP address. The email address is entered in the Specifically field.
- Complete the Validity section as required:
Field / Option Description Enable / Disable Use this to enable (default) or disable a policy. If a date range has been specified, the policy will automatically be disabled when the end of the configured date range is reached. Set Policy as Perpetual If the policy's date range has no end date, this field displays "Always On" meaning that the policy never expires. Date Range Use this field to specify a start and / or end date for the policy. If the Eternal option are selected, no date is required. Policy Override This overrides the default order that policies are applied. If there are multiple applicable policies, this policy is applied first unless more specific policies of the same type are configured with an override. Bi-Directional If selected the policy is applied when the policy's recipient is the sender, and the sender is the recipient. Source IP Ranges (n.n.n.n/x) Enter any required Source IP Ranges for the policy. These only apply if the source IP address used to transmit the message data, falls inside or matches the range(s) configured. IP ranges should be entered in CIDR notation.
- Click on the Save and Exit button.