text_combined: victor duchovni dxdewmdieulnutmorganstanleycom wed feb 13 2008 010045pm 0100 martin schmitt schmitt systems wrote victor duchovni schrieb default postfix explicitly uses dns explained previous response solution sites nsswitch files dns want postfix use smtp_host_lookup native hidden question though whether anything wrong docs 250 postconf5 disable_dns_lookups default disable dns lookups postfix smtp lmtp clients disabled hosts looked getaddrinfo system library routine normally also looks etchosts dns lookups enabled default smtp_host_lookup default dns mechanisms postfix smtp client uses look hosts ip address parameter ignored dns lookups disabled apart fact english syntax description smtp_host_lookup slightly garbled since least 213 proper interpretation two along disable_dns_lookups parameter fact disable mx lookups smtp_host_lookup native smtp_host_lookup changes mx host ip addresses resolved disable mx lookups disable_dns_lookups parameter largely obsolete needed noninternet connected environments dns unavailable used recommended content_filter smtp transports avoid latency due address rewriting canonicalized replaced cname lhs rhs host names ervvdomain email addresses rfc 2821 longer requiring domains email addresses cnames rewriting longer done approximately postfix 20 bottom line one wants use nondns host names smtp nexthops right setting smtp_host_lookup native better solution use private dns zone names namedconf zone localhost type master file localhost localhost ttl 2d default ttl soa localhost postmasterlocalhost 1 constant serial slaves 10800 refresh 3 hours 3600 retry 1 hour 604800 expire 1 week 3600 minimum ttl 1 hour ns localhost 127001 private dns records gwexamplecomlocalhost 192021 transport table examplecom relaygwexamplecomlocalhost way everything dns even load balancing mx records multiple records viktor disclaimer offlist followups get onlist replies get ignored please ignore replyto header unsubscribe postfixusers list visit httpwwwpostfixorglistshtml click link response solves problem best way thank send worked thanks followup must respond please put worked thanks subject delete quickly tue 05 aug 2008 230452 0500 force postfix look hosts file first