[Fiware-elearning] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host omail02.eng-mo.it.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<gustavokent at germanmails.biz>: host mail.germanmails.biz[185.82.20.48] refused
    to talk to me: 421 Too many concurrent SMTP connections; please try again
    later.
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From: "Admin User" <fiware-elearning at lists.fi-ware.org>
Subject: FIWARE Academy: account confirmation
Date: Mon, 8 Jun 2015 18:23:48 +0200
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