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postfix and plesk domains

EricVis

Basic Pleskian
main domain DOMAIN111.com set on shared IP
10 x dedicated IP + client domain via plesk11


PHP mail() sends email from client1 on DOMAIN222.COM on deicated IP
in plesk maillog it shows as ftpuserdomain222@domain111.com so looks like postfix sends email from shared IP?

when I do tcpdump on 25 I can see dedicated IP making connection to the world but maillog show domain111.com

how it works?
it is important so I can set proper SPF records, not sure if SPF should have main shared IP or dedicated IP of the lcient?
 
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