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Postfix Documentation
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Forced probe routing examples

In a typical scenario one would override the relayhost setting for address verification probes and leave everything else alone:

/etc/postfix/
main.cf:
    
relayhost = $
mydomain
    
address_verify_relayhost =
    ...

Sites behind a network address translation box might have to use a different SMTP client that sends the correct hostname information:

/etc/postfix/
main.cf:
    
relayhost = $
mydomain
    
address_verify_relayhost =
    
address_verify_default_transport = direct_smtp

/etc/postfix/
master.cf:
    direct_smtp .. .. .. ..  .. .. .. .. .. smtp
        -o 
smtp_helo_name=nat.box.tld
Postfix Documentation
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