Tadeu De Chiacchio Puelles wrote:
but the servers stay resolving dns names...
Mar 17 17:37:31 nitro fetchmail[1427]: SMTP error: 417 DNS lookup failure ...
and delay or not receive some e-mails.

turning off dnslookup and identlookup affect tcpd, not smtpd. Solution: don't use smtpd. Configure your fetchmail to use maildrop directly, or use "sendmail" if you're delivering to multiple local users:


defaults mda "/usr/sbin/sendmail %T";

or:

defaults mda "/usr/lib/courier/bin/maildrop";



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