postfix disable_dns_lookups query

Discussion in 'Server Operation' started by vmos, Jun 9, 2011.

  1. vmos

    vmos Member

    Good afternoon,
    we've got a few clients having trouble sending mail through our relay server (postfix on ubuntu 10.04) the error message is verification failed: Name or service not known

    when I do a lookup on the domain name, it doesn't resolve to an IP and I presume that's why postfix is rejecting it.

    However, this server authenticates by sender IP or username, it shouldn't care wether or not the sending servers domain name resolves to an IP.

    I can set this option

    disable_dns_lookups = yes

    but it's not clear whether or not this has an effect on the outbound mail, can anyone clarify this?

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