How about maildrop?  Nothing I know of (except procmail) will use existing 
.procmailrc files, but e.g. 
http://www.wonkity.com/~wblock/docs/html/maildrop.html 
<http://www.wonkity.com/~wblock/docs/html/maildrop.html> shows some examples of 
migrating (e.g. sendmail configuration, some .procmailrc to .mailfilter 
examples, etc).  AFAIK, maildrop also plays nice with postfix (common on Macs, 
right?).  And there's already a port for maildrop, that's standalone and not 
merely a plugin into an MTA; I'm not so sure there's a standalone sieve port.

> On Feb 2, 2019, at 20:59, Dave Horsfall <d...@horsfall.org> wrote:
> 
> On Sun, 3 Feb 2019, Joshua Root wrote:
> 
>> No official policy. My view is that the only clear-cut case is when a port 
>> doesn't build or work at all, anywhere, and there's no real chance of that 
>> ever changing.
> 
> How about insecure ports such as Procmail?  It's a scripting language, with 
> Shell access, that believes user data;  I believe it's no longer maintained 
> by the author, and the coding style is unreadable, making it difficult to 
> spot vulnerabilities.
> 
> http://www.cvedetails.com/vendor/225/Procmail.html makes interesting reading, 
> as does any search for "procmail CVE".  Perhaps it's just me, but I don't 
> think insecure software belongs in MacPorts unless someone is willing to fix 
> it (and good luck with Procmail).
> 
> There are alternatives; I cannot remember their names. but "sieve" (or
> similar) springs to mind.
> 
> -- Dave
> 

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