is there an easy way to get the IP ranges of T-mobile?

I don't know how accurate this might be, but it claims to be all the IPv4 and IPv6 address ranges owned by T-Mobile:

Eli the Bearded asked:

You may not need them. SPF has include:domain which allows one SPF record to include all of another's ranges (if T-Mobile has an SPF record; I didn't look).

As to -all, just a caution: If you send email to an old-style mailing list or forwarder that simply forwards your message as received, it will have your address as sender, but come from the mailing list's host, and thus will violate your -all rules, unless you also include the list's hosts in your SPF record. -WBE

Jeff Liebermann's answer is interesting, but great. It's how to find all the IP blocks T-mobile owns, but not how to find out which ones they'll assign to customers. (And they are very unlikely to assign customers IPs from the same range as say, their web site or their corporate offices.)

I did mention that. "I want to have an IP range or an include". (The include gives the range(s), if you read it.) I just don't know if they publish one for this use case.

I'm aware of the meaning of -all and have been around long enough to know the many diverse ways of implementing mailing lists. The distinguishing factor to identify lists like that is "Do you get the bounce messages when someone's email address goes bad?"

Elijah

------ does not plan to use this for mailing lists

Eli the Bearded asked:

I replied, in part:

Eli replied:

Sounds like you're trying to do what I used to do ...

I used to send outgoing mail via my ISP's outbound mail server, and, like you, I wanted -all. My ISP's SPF record used ~all, so I used their SPF record to find their mail hosts/addresses, and then put those directly into my SPF record rather than using include:ISP.

I just checked... t-mobile.com's SPF "TXT" record is:

"v=spf1 mx a:mail1.t-mobile.com a:mail3.t-mobile.com a:maila.t-mobile.com a:mailc.t-mobile.com include:aspmx.pardot.com include:_spf.q4press.com ~all"

mail1.t-mobile.com: 206.29.177.243 206.29.177.244 206.29.177.245 206.29.177.246 206.29.177.247

mail3.t-mobile.com: 208.54.102.78 208.54.102.81 208.54.102.80 208.54.102.79 208.54.102.77

maila.t-mobile.com: 206.29.177.252 206.29.177.253 206.29.177.251 206.29.177.250

mailc.t-mobile.com: 208.54.102.83 208.54.102.76 208.54.102.75 208.54.102.82

but that doesn't include the SPF include's.

[There's also t-mobile.{at,co.uk,cz,de,hr,hu,mk,nl,pl,sk} and maybe others, but Panix suggests you're in the U.S. and wouldn't care about those.]

Indeed. :) -WBE

I have regular email at panix, but I want a stripped down mobile email that I read and send from, mostly connecting to my own mail hosts but possibly sendind directly.

That's probably corporate email. When I was on Sprint, the customer stuff used addresses of the form , and pixmbl.com has a nice simple SPF record. I don't know what T-Mobile does for this.

True, but based on the Sprint example, I think it's the wrong tree.

Elijah

------ has gotten himself a nice very short domain for this mobile stuff

It's similar (PHONENUMBER@) for the others I know about, but I don't happen to know what host name T-Mobile uses.

Can you send a message from your cellphone to some account that lets you examine the message headers? -WBE