Postfix and gmali

[kurdak]

The problem is that it does not reach e-mail's from the server on which I have installed ispcp.

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But how can I fix this, Google says that:
The IP address you use to send e-mail, is not entitled ...
In order to prevent the sending of spam Gmail does not accept mail messages in which the IP address of the sender domain does not correspond to the sender. To send mail from your server to Gmail, we recommend that you use your ISP SMTP relay. At present we can not add IP addresses to the whitelist or make exceptions to this rule.