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Old 9th June 2011, 16:20
vmos vmos is offline
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Default postfix disable_dns_lookups query

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

blah.server.com 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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