how to find out where email is being hosted for a website

Is there a whois equivalent to find out the hosting details for email?

From serverfault iamjonesy

• The MX record is part of the DNS record for a domain name; you can look at the record directly, or just use a website like MX toolbox: http://www.mxtoolbox.com/SuperTool.aspx?action=mx%3agmail.com

  This will direct you to the address of the mail server.

  However, this isn't always the actual mail server - in some environments this is actually the address of the spam filter, which forwards the messages to the actual mail server where they are stored.

  joeqwerty : +1. I was going to post the same answer until I read yours. As you said, the MX record is not always a direct indication of where the email is actually hosted.

  Chris : What about private registration?

  joeqwerty : What do you mean? It's irrelevant whether or not the domain registration is private. If the owner of the domain wants to recieve email at the domain then he\she needs an MX record (or barring that, an A record for the domain) to tell sending MTA's where to send email for the domain. As Mitch stated in his answer, the MX record is not a direct indicator of where the email is actually hosted.
  From Mitch Miller

• look up the MX record in DNS.

  on windows: at cmd prompt:

  nslookup <enter>
  set type=MX <enter>
  hotmail.com <enter>
  

  jscott : +1. Don't forget `exit ` :)

  Nick Kavadias : haha.. why would you ever want to exit nslookup! good point though, i always mess that up with *quit*
  From Nick Kavadias

• On Windows, or *nix this will return the MX records:

  nslookup -q=mx domain.tld

  For a *nix script-parsable one liner:

  dig -t MX +short domain.tld

  From jscott