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I config smtp server with postfix , and Debian 6.

I set 1 ip from 4 Ips of server for smtp server

mail.mydomain.com xxx.yyy.zzz.hhh

but when I send mail with smtp server , Destination server give back to me another ip of server.

Received-SPF: fail (google.com: domain of root@mail.mydomain.com does not designate xxx.yyy.zzz.jjj as permitted sender) client-ip=xxx.yyy.zzz.jjj; Authentication-Results: mx.google.com;

spf=hardfail (google.com: domain of root@mail.mydomain.com does not designate xxx.yyy.zzz.jjj as permitted sender) smtp.mail=root@mail.mydomain.com

In my Bind configuration and /etc/hosts config this subdomain passed to correct IP . for this IP changed my SPF check give me failed .

what happend when i send mail with smtp server ?

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You should add the four IPs to DNS record like

v=spf1 ip4:x.x.x.x ip4:x.x.x.x ip4:x.x.x.x ip4:x.x.x.x  -all    
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