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From: Tim Watts <tw_usenet@dionic.net>
Newsgroups: comp.os.linux.misc
Subject: Re: Script to parse a text file and extract unique email addresses
Date: Thu, 21 Aug 2014 10:53:07 +0100
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Xref: csiph.com comp.os.linux.misc:11771

On 20/08/14 23:26, Andreas Kohlbach wrote:
> Try
>
> grep -E -o "\b[a-zA-Z0-9.-]+@[a-zA-Z0-9.-]+\.[a-zA-Z0-9.-]+\b"|sed -e 's/^//'
>
> to extract from the file.
>

You need to include + and _ in the local part as well - a very common 
component.