Mark Alan:
> 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

http://www.postfix.org/postconf.5.html#smtpd_etrn_restrictions

        Wietse

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