ISP's may or may not be a part of an email address, and may not even be
discoverable if someone has a domain hosted on a remote server. If you mean to
group them by domain, then the easiest way would be to use a "helper" column
and sort on that.
For example, with your data in A1:A10000:
B2: =MID(A1,FIND("@",A1)+1,255)
and copy/drag down to B10000. Then Data/Sort on Column B.
•Create a helper column to the right of the address table
•Enter this formula (assuming the email address is in A2):
=MID(A2,FIND("@",A2)+1,255)
That will return just the ISP portion of the email address
•Now, sort by that column
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