[kuon]

My email is old, pre 2000, I got my own email server, and got about 50000 spam emails daily. About 500 goes beyond retry¹, IP ban and reverse DNS check, and rspamd let about 10 through daily.

I am not saying obfuscation is useless, just that email filtering works quite well.

¹: retry is to refuse emails from unknown servers by default and force them to retry later with 451 error.

[Ayesh]

> 50000 spam emails daily

If I ever reach this level (still using my 2009 email address), I would just abandon this email address and start with a new one.

> ¹: retry is to refuse emails from unknown servers by default and force them to retry later with 451 error.

Interesting approach. Can you configure a low enough (try-again-in-X-seconds) value? Are you not worried that legitimate emails get dropped here? I imagine transactional emails to not try and resend later?

[kuon]

> If I ever reach this level (still using my 2009 email address), I would just abandon this email address and start with a new one.

Actually I have a business and this email is on all paper documents since nearly 30 years.

> Interesting approach. Can you configure a low enough (try-again-in-X-seconds) value? Are you not worried that legitimate emails get dropped here? I imagine transactional emails to not try and resend later?

It is part of the SMTP standard, all legitimate mail server actually respect that. Also, if there is a false positive, the sender should get a report email back.

[layer8]

Similar experience here. I still use SpamAssassin, in addition to DNSBL, and spam is very manageable, more like five per day on average. Amazingly, SpamAssassin produces zero false positives for me.