Extract domains from a text file

I'd like to extract a list of domains from a text file which includes Email addresses.   However, the objective is to list only the domains -- not complete Email addresses.  If there is a Windows-based application to perform this, please advise.
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Would probably depend on the exact formatting but Excel might do it if it's just a list of email addresses.
"Text to columns" delimited by the @ sign.

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ddantesAuthor Commented:
Thank you.  I extracted all Email addresses from the text file into an Excel Worksheet.  I don't know how to perform the "text to columns" delimited by the @ sign which you specified.
In newer (2010 and 2013) versions of Excel it's on the data tab.
Select the column containing the email addresses, choose Data -> Text to Columns -> Delimited -> Next -> Other (@) -> Finish
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ddantesAuthor Commented:
Sorry to say, I use Excel 2007.
ddantesAuthor Commented:
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