In <40C30C10(_dot_)8080805(_at_)whipple(_dot_)org> Weldon Whipple
<weldon(_at_)whipple(_dot_)org> writes:
Meng Weng Wong wrote:
mengwong._spf.pobox.com TXT "v=spf1 a:dumbo.pobox.com -all"
user1._spf.pobox.com TXT "v=spf1 include:earthlink.net ?all"
user2._spf.pobox.com TXT "v=spf1 include:verizon.net ?all"
Thanks for the explanation! I have implemented the above on the domain
I mentioned in my note. I notice in the above that mengwong... ends in
-all, and user1... and user2... end in ?all. Is there a way of saying
the following: "Everyone else (not specifically mentioned) should be
'-all'" --kind of a wildcard that eliminates all other addresses in
pobox.com?
I'm pretty sure that this will work:
*._spf.pobox.com TXT "v=spf1 -all"
Also (I seem to remember discussion of this a year ago or so): I
assume that _spf (with the leading underscore) is a somewhat
arbitrary third-level domain? (Specifically, is it OK to omit the
leading underscore; also is it OK to use something other than "_spf"?)
Yes, it is arbitrary. Using an underscore prevents it from being a
"host name", which means that you can't use it in an email address or
a web server. This is probably a good thing to do. There are other
characters that are loowed in domain names but not in host names, such
as "/" which you can use instead.
-wayne