Standard description: No valid author signature, adsp_override is CUSTOM_MED


The presence of this test indicates that DKIM support is enabled on the server.

The mail does not contain a valid DKIM signature and the domain of the sending address has been matched by an override setting (adsp_override).

For frequently seen domains that either do not publish an ADSP (Author Domain Signing Practices) records, or where a stronger (or weaker) policy is desired, the values can be specified in the configuration, saving the need for a DNS lookup.

The current default custom_med overrides in include entries for Yahoo and Google domains.

One reason for not seeing a signature on a mail from an domain which routinely signs them is that the signature header may have been stripped out, for example as part of a mailing-list expander.

Further Info

The default scores for this rule can be found in the online list of tests.


Rules/DKIM_ADSP_CUSTOM_MED (last edited 2011-01-11 01:09:58 by upc)