<div dir="ltr"><div dir="ltr">On Mon, 29 Jul 2019 at 20:40, Pierre Abbat <<a href="mailto:phma@leaf.dragonflybsd.org">phma@leaf.dragonflybsd.org</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Monday, 29 July 2019 13.10.27 EDT Constantine A. Murenin wrote:<br>
> Greylisting through PF spamd is also an option.<br>
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Crater and leaf run Postfix, as do my mail servers. I use Postgrey.<br></blockquote><div><br></div><div>Postfix's not a firewall, so, there's no reason it should be incompatible with PF spamd.<br></div><div><br></div><div> <a href="http://mdoc.su/o/spamd.8">http://mdoc.su/o/spamd.8</a><br></div><div><br></div><div>PF spamd certainly has some drawbacks, but one of the benefits is that you could whitelist certain hosts through passive OS fingerprinting, which could make sure you don't actually get any mail ever delayed from the friendly boxes worldwide.<br></div><div><br></div>C.</div></div>