Maybe I could be hitting a cache or something, but here's what I see:

  $ host Altaba.com
  Altaba.com mail is handled by 10 alt4.aspmx.l.google.com.
  Altaba.com mail is handled by 1 aspmx.l.google.com.
  Altaba.com mail is handled by 5 alt1.aspmx.l.google.com.
  Altaba.com mail is handled by 5 alt2.aspmx.l.google.com.
  Altaba.com mail is handled by 10 alt3.aspmx.l.google.com.

Here's yahoo.com for reference:

  $ host yahoo.com
  yahoo.com has address 206.190.36.45
  yahoo.com has address 98.138.253.109
  yahoo.com has address 98.139.183.24
  yahoo.com has IPv6 address 2001:4998:58:c02::a9
  yahoo.com has IPv6 address 2001:4998:c:a06::2:4008
  yahoo.com has IPv6 address 2001:4998:44:204::a7
  yahoo.com mail is handled by 1 mta7.am0.yahoodns.net.
  yahoo.com mail is handled by 1 mta5.am0.yahoodns.net.
  yahoo.com mail is handled by 1 mta6.am0.yahoodns.net.

And that's not everything because this is the TXT record

altaba.com. 1800 IN TXT "google-site-verification=vO3De5z6qb-AeM1GmHkcC5dlWA_cw-7WKN5xhcyFFPM"

That's required for Google's domain ownership verification, which is a pre-requisite to enabling G Suite (formerly known as Google Apps for Domains).