mouss qpeqrnetoyennet james parra wrote james parra wrote hello client month getting following error sending mail us following recipients could reached oyopvgiourdomaincom 282008 417 pm smtp communication problem recipients email server please contact system administrator helo command rejected need fullyqualified hostname postfix log says following feb 8 122104 postserver postfixsmtpd22189 warning 6422240195 address listed hostname nsky3com feb 8 122105 postserver postfixsmtpd22189 noqueue reject rcpt unknown6422240195 504 helo command rejected need fullyqualified hostname protoesmtp helo add maincf allow ip address domain access tell client fix helo name spamserver non fqdn provocation prefer surrender remove reject_non_fqdn_hostname reject_non_fqdn_helo_hostname suggest client ask clients vantage point server one rejecting mail need tread politely course need find right words helpful firm tell whitelist youre open dont want anyone else whitelisted must ip must take responsibility mail coming ip may delivery issues elsewhere may realize sites may discarding mail didnt happen yet chances happen future many people getting sick supporting zombies broken sites short system configured according standards helo name must fqdn hostname ip literal system must correct reverse dns ipnameip must result original ip concerning removing reject_non_fqdn_hostname reject_non_fqdn_helo_hostname something want werent client wouldnt worry much must way could add exception maincf domain ip address would easier showed config need put check_client_access returns ok must put wrong place acceptable example smtpd_recipient_restrictions reject_unauth_destination reject_non_fqdn_sender reject_non_fqdn_recipient reject_invalid_hostname check_client_access cidretcpostfixbroken_client reject_non_fqdn_hostname broken_client 1012332 ok short move reject_non_fqdn_hostname enough able add broken_client check without affecting checks less appealing alternative make reject_non_fqdn_hostname result check_client_access 1012332 dunno 00000 reject_non_fqdn_hostname add complexity wed 06 aug 2008 010619 0100 server rejecting mail single domain