Mumtaz Ali wrote:
 i m sending you my main.cf ( named setting) file and  my classes definition 
files..
and in logs it says  " relay access denied "  i m not expert i m authentication 
local linux
users with my networks ... it rejects mail when i set " mynetworks = 127.0.0.0/8"


please post to the list (this increases the chances to get help, and this helps improving the archives so that people can find answers ifthey have the same problems).

if you set mynetworks = 127.0.0.0/8, then postfix will not relay mail except if you submit it from localhost. relay means sending mail to "foreign" domains (domains not managed by your postfix).

if you want postfix to relay for some clients (machines), put their IPs in mynetworks (see mynetworks doc for the valid notations). this assumes that these IPs are static and "trusted".

if you want to relay mail for "untrusted" machines, you'll need to setup SASL authentication.

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