Thanks, I don't know how to do it, by default the server send all mail via its default IP and I have a lots of problems with the DNS SPFs send the email to the Junk Folder
The oslution for that is not to send emails under different IP addresses. A mailserver always sends the emails for all domains under its main IP. If you have problems with spamfilters, then check the following things:
1) Ensure that the reverse dns record for the IP address matches the hostname of the server.
2) Create spf records for all domain names and configure them to allow sending for the hostname of the server.