How to check if an email address is managed by google

Lots of institutions have used Google’s mail service and there is a simple way to check if a mail domain is managed by Google, or NOT.

For example,

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host -tmx sheffield.ac.uk

The result is:

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sheffield.ac.uk mail is handled by 20 alt1.aspmx.l.google.com.
sheffield.ac.uk mail is handled by 30 aspmx2.googlemail.com.
sheffield.ac.uk mail is handled by 30 aspmx3.googlemail.com.
sheffield.ac.uk mail is handled by 20 alt2.aspmx.l.google.com.
sheffield.ac.uk mail is handled by 10 aspmx.l.google.com.
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