Does, Allow current IP address of the domain to send email for this domain mean the IP address of the domain's "@" A record, in most cases the web server? Say domain.com's A record for domain.com is 192.168.1.2 which is the webserver, so SPF will accept mail form the web server? Is this correct? Thanks..
Yes... this means, that every server with an A / AAAA record in the dns-zone is allowed to send mail. www = 1.2.3.4 mailserver = 2.3.4.5 other = 3.4.5.6 SPF won't fail if the mail comes from 1.2.3.4, 2.3.4.5 or 3.4.5.6