* Jon L Miller <[email protected]>:
> Is there a preferred list of rbl sites one can use in postfix.

No.

> warning: 21.27.134.89.zen.spamhaus.org: RBL lookup error: Host or domain
> name not found. Name service error for name=21.27.134.89.zen.spamhaus.org
> type=A: Host not found, try again

Your DNS lookups are broken:
$ host 21.27.134.89.zen.spamhaus.org
21.27.134.89.zen.spamhaus.org has address 127.0.0.11
21.27.134.89.zen.spamhaus.org has address 127.0.0.4

> Feb 19 14:45:44 mmtlnx postfix/smtpd[31220]: warning: support for
> restriction "reject_maps_rbl" will be removed from Postfix; use
> "reject_rbl_client domain-name" instead

Use "reject_rbl_client zen.spamhaus.org" in smtpd_*_restrictions
instead of using the deprecated "reject_maps_rbl zen.spamhaus.org"

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  [email protected] | http://www.charite.de
            

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