On 4 May 2022, at 20:40, [email protected] wrote: > > Though not currently bouncing my maillog had this message (sanitized > because of Google): > > NOQUEUE: reject: RCPT from avasout-peh-001.plus.net[212.159.14.17]: 554 5.7.1 > Service unavailable; Client host [212.159.14.17] blocked using > zen.spamhaus.org; Error: open resolver; > https://www.spamhaus.org/returnc/pub/172.69.133.38; > from=<[email protected]> to=<[email protected]> proto=ESMTP > helo=<avasout-peh-001.plus.net>
This is because your DNS resolution is via open DNS such as Google’s 8.8.8.8 or Quad9’s 9.9.9.9 or Cloudflare’s 1.1.1.1. You can get rid of it, and use Spamhaus just fine, by installing a caching resolver such as unbound. Cheers, Arrigo
