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SPF-aware greylisting and filter-greylist #26
I am happy to see you talk about SPF-aware greylisting. This seems like the natural solution.
Also, I am also happy to see you talk about tarpitting via laggy SMTP transactions. On my exim4 servers I do this using the
... or maybe it does have something for that, but I haven't found it yet. I am new to opensmtpd but so far am quite happy with it. Thank you for your great work!
Thanks for your comment :-)
I have committed an additional change to
For the tarpitting, we decided not to bring that in builtin filters because it is tricky to do there and it is trivial to do in proc filters. I have written
Thank you for your work on all these filters and on OpenSMTPd in general!
I've been noticing some connections from Google servers still getting greylisted by IP rather than domain, and thus never getting whitelisted. My guess is these are from G Suite domains which haven't (correctly) set up SPF. I'm not sure what to do about that.