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Note:

The emails are given for an idea about domains and types of emails. The initial ID of email has been removed with (EMAIL) letters in these sample addresses 

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(EMAIL)@gmx.de
(EMAIL)@t-online.de
(EMAIL)@a-an.de
(EMAIL)a-appel@gmx.de
(EMAIL)@freenet.de
(EMAIL)@freenet.de
(EMAIL)@gmx.de
(EMAIL)@t-online.de
(EMAIL)@t-online.de
(EMAIL)@web.de
(EMAIL)@gmx.de
(EMAIL)@guggolz.net
(EMAIL)@foni.net
(EMAIL)@onlinehome.de
(EMAIL)@arcor.de
(EMAIL)@free.de
(EMAIL)@metronet.de