#!/bin/sh
 set -euC
 
 # nfsn-dns-spf DOMAIN NAME [INCLUDE]...
 
 # nfsn-dns-spf "example.com" "mailgun.org"
 
 # Arguments.
 
 domain="$1" ; shift
 name="$1" ; shift
 
 # Process.
 
 data="$(
     printf -- "v=spf1"
     for include in "$@"
     do
         printf -- " include:%s" "$include"
     done
     printf -- " -all"
     printf -- "\n"
 )"
 
 # Update.
 
 nfsn-dns-update "$domain" "$name" "TXT" '^v=spf1' "$data"