$TTL 300
@                IN NAPTR 100 10 "U" "E2U+sip" "!^.*$!sip:customer-service@example.com!" example
                 IN NAPTR 102 10 "U" "E2U+email" "!^.*$!mailto:information@example.com!" example
                 IN NAPTR 103 10 "U" "E2U+email" "!^.*$!mailto:information@example.com!" .
                 IN NAPTR 104 10 "U" "E2U+email" "!^.*$!mailto:information@example.com!" .