Most domains send outbound mail through a relatively small number of servers. Domains should describe that set of servers in an SPF record in their DNS. Internet email receivers can then reject forged messages which don't come from an envelope sender domain's approved servers. This wizard helps domain owners identify all the servers which could be expected to send mail from their domain.

example.com's IP address is 192.0.32.10 (www.example.com). Does that server send mail from example.com?		yes no
example.com has no MX servers.
Do you want to just approve any host whose name ends in example.com? (Expensive, unreliable and not recommended)		yes no
Do any other servers send mail from example.com? You can describe them by giving "arguments" to the a:, mx:, ip4:, and ptr: mechanisms. mx: takes domain names and approves all the MX servers of these domains. To keep the wizard short we left out ptr:, but it works analogously.		regular hostnames
		domain names
IP networks can be entered using CIDR notation, eg. 192.0.2.0/24		IP addresses
Could mail from example.com originate through servers belonging to some other domain? If you send mail through your ISP's servers, and the ISP has published an SPF record, name the ISP here.
Do the above lines describe all the hosts that send mail from example.com?		yes no
example.com. IN TXT "v=spf1"