While using Postfix 2.7.1 at an Ubuntu 10.10 server: We disabled ETRN as stated in the 'Configuring the Postfix fast ETRN service' section of the ETRN_README.html
(...) smtpd_delay_reject = yes fast_flush_domains = mydestination = localhost.localdomain, localhost mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 relay_domains = $mydestination smtpd_etrn_restrictions = (...) The problem is that Postfix is still announcing 250-ETRN, and we are being hit by very persistent machines that keep issuing: etrn some.domain.tld just to get: 459 <some.domain.tld>: service unavailable Regards, M.
