Hi Dave,

I do similar work in MIMEDefang using the a redis backend for caching valid
recipients combined with Net::validMX that can check to see if a sender has
valid MX before sending.  I have a release of Net::validMX I'm about to
post this week in fact.

If you are interested, let me know.


Kevin A. McGrail
Asst. Treasurer & VP Fundraising, Apache Software Foundation
Chair Emeritus Apache SpamAssassin Project
https://www.linkedin.com/in/kmcgrail - 703.798.0171

On Mon, Apr 9, 2018 at 10:24 AM, David Jones <djo...@ena.com> wrote:

> I was wondering if anyone knows of an SA plugin or another method to
> determine if the envelope-from domain has a valid MX record that is
> listening on TCP port 25.  I don't think it would be a major scorer but it
> could be useful in meta rules.
> Been playing around with rspamd over the weekend to see how it compares
> and so far not that impressed.  It has a few features that are interesting
> like the MX check but other than that it's not as impressive as the author
> makes it out to be on the website comparing it to SA.
> It claims to have better Bayes but so far I am seeing identical results
> after identical training.
> The Universal Configuration Language is terrible and hard to wrap your
> head around it when the structure is so loose.  Since it's not well defined
> nor well documented it takes a lot of trial and error to figure it out.
> It doesn't seem to be as flexible as SA in many regards.
> Right now I have rspamd only adding headers so I can compare with SA.
> Tuning it out to match SA's accuracy is proving to be very challenging and
> time consuming.
> --
> David Jones

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