PureMessage IP blocking can be configured for an
external version of sendmail. To enable IP blocking, you must add an m4 file to your sendmail
installation. The required file, sockmap.m4, is included in the version of
sendmail that is bundled with PureMessage. You must
temporarily install PureMessage sendmail, and then copy
the sockmap.m4 file to your existing sendmail installation. Follow the
steps in the order they are described below.
Note: As external/third party versions of sendmail are not quality-assured for integration with
PureMessage, Sophos reserves the right not to provide
support for an issue that appears to be related to any such custom configuration, and may
recommend that you install the version of sendmail bundled with PureMessage to further a resolution.
Note: By default, if sendmail is unable to contact PureMessage's IP Blocker service, the message is passed through.
To change this behavior so that messages are tempfailed instead, see the comments in the
sockmap.m4 file.