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Disclosure: I worked on spfwalk and am the author of spf_fetch.

Adding recursive spf-record fetching to opensmtpd’s smtpctl(8) utility makes whitelisting senders like Google (who often retry from large pools of addresses) much more reliable, resulting in more timely delivery of email.

It’s a welcome addition to an already excellent mail server.

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    I’m adding spfwalk to spf_fetch as a tool, and support for spfwalk and the smtpctl version to spf_fetch. The scripts in spf_fetch, along with a bit of config and cron(8), handle the work of updating pf(4) records.