|In an attempt to lower your spam score, using the forceful -all SPF value instead of the neutral ~all is one simple way of doing this. However, as -all is enforced, it means that all of your clients who send on a domain using -all MUST use your server to send their email, and cannot send email through their own IPs, unless you include their SPF settings in the dns record.|
1) Future Domains
To use the -all format for all future domains, not yet created, type:
2) Existing Domains
To swap all existing domains to the -all format, where the zones are in , you'd type:
cp -f /var/named /var/named.backup
For FreeBSD, use /etc/namedb.
For Debian, use /etc/bind.
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