IronPort - advanced configuration guide

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Enabling SPF and SIDF 5-24 Cisco <strong>IronPort</strong> AsyncOS 7.6 for Email Advanced Configuration Guide Chapter 5 Email Authentication To use SPF/SIDF, you must enable SPF/SIDF for a mail flow policy on an incoming listener. You can enable SPF/SIDF on the listener from the default mail flow policy, or you can enable it for particular incoming mail flow policies. To enable SPF/SIDF on the default mailflow policy via the GUI: Step 1 Click Mail Policies > Mail Flow Policy. Step 2 Click Default Policy Parameters. Step 3 In the default policy parameters, view the Security Features section. Step 4 In the SPF/SIDF Verification section, click Yes. Figure 5-17 Enabling SPF/SIDF in the Mail Flow Policy Step 5 Set the level of conformance (the default is SIDF-compatible). This option allows you to determine which standard of SPF or SIDF verification to use. In addition to SIDF conformance, you can choose SIDF-compatible, which combines SPF and SIDF. Table 5-1 SPF/SIDF Conformance Levels Conformance Level Description SPF The SPF/SIDF verification behaves according to RFC4408. - No purported responsible address (PRA) identity verification takes place. NOTE: Select this conformance option to test against the HELO identity. OL-25137-01
Chapter 5 Email Authentication OL-25137-01 Note More settings are available via the CLI. See Enabling SPF and SIDF via the CLI, page 5-25 for more information. Step 6 If you choose a conformance level of SIDF-compatible, configure whether the verification downgrades a Pass result of the PRA identity to None if there are Resent-Sender: or Resent-From: headers present in the message. You might choose this option for security purposes. Step 7 If you choose a conformance level of SPF, configure whether to perform a test against the HELO identity. You might use this option to improve performance by disabling the HELO check. This can be useful because the spf-passed filter rule checks the PRA or the MAIL FROM Identities first. The appliance only performs the HELO check for the SPF conformance level. Enabling SPF and SIDF via the CLI Table 5-1 SPF/SIDF Conformance Levels Conformance Level Description SIDF The SPF/SIDF verification behaves according to RFC4406. -The PRA Identity is determined with full conformance to the standard. - SPF v1.0 records are treated as spf2.0/mfrom,pra. - For a nonexistent domain or a malformed identity, a verdict of Fail is returned. SIDF Compatible The SPF/SIDF verification behaves according to RFC4406 except for the following differences: - SPF v1.0 records are treated as spf2.0/mfrom. - For a nonexistent domain or a malformed identity, a verdict of None is returned. NOTE: This conformance option was introduced at the request of the OpenSPF community (www.openspf.org). The AsyncOS CLI supports more control settings for each SPF/SIDF conformance level. When configuring the default settings for a listener’s Host Access Table, you can choose the listener’s SPF/SIDF conformance level and the SMTP actions (ACCEPT or REJECT) that the appliance performs, based on the SPF/SIDF verification results. You can also define the SMTP response that the appliance sends when it rejects a message. Depending on the conformance level, the appliance performs a check against the HELO identity, MAIL FROM identity, or PRA identity. You can specify whether the appliance proceeds with the session (ACCEPT) or terminates the session (REJECT) for each of the following SPF/SIDF verification results for each identity check: None. No verification can be performed due to the lack of information. Neutral. The domain owner does not assert whether the client is authorized to use the given identity. SoftFail. The domain owner believes the host is not authorized to use the given identity but is not willing to make a definitive statement. Fail. The client is not authorized to send mail with the given identity. TempError. A transient error occurred during verification. Cisco <strong>IronPort</strong> AsyncOS 7.6 for Email Advanced Configuration Guide 5-25
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Cisco IronPort AsyncOS 7.6 for Emai
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OL-25137-01 Preface xvii Before you
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OL-25137-01 AsyncOS Quick Reference
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Appendix A AsyncOS Quick Reference
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FTP Access OL-25137-01 Accessing th
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Appendix B Accessing the Appliance
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Appendix B Accessing the Appliance
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