[iconjack]

It was wild to me too. I have an .xyz domain, which seemed appropriate for a non-commercial math site. I'd try to send links of math experiments to friends and colleagues via SMS, so they could tell me if they worked right on their phones or not. Can't tell you how much confusion and frustration it caused that the links were simply not being delivered, though all the conversation around the links went through just fine. No error was reported on either end. A year or so ago, I did a lot of searching trying to find some explanation of this bizarre behavior, but found literally nothing. It's nice to know I'm not crazy, at least. Is there a published list of what domains are not allowed to go through?

[schleck8]

> which seemed appropriate for a non-commercial math site

They are used by large cooperations too. The Alphabet domain is abc.xyz. Science Corp's is science.xyz.

[mhh__]

I didn't know about abc.xyz, that's a really nice URL

[samspenc]

Quite likely only investors in Google / Alphabet stock know that site and have it bookmarked because that's where Alphabet publishes its quarterly earnings. I also guess for the same reason, it only gets significant traffic once a quarter during earnings season.

[lrem]

I like to think of it as Ruth's blog ;)

[GoblinSlayer]

SMS has a delivery confirmation feature, my phone indicates delivered and undelivered messages, so you can tell what wasn't delivered.