I suspect(!) that this is a protection against being used as a spam source. You have to wait a certain time before the next email is accepted.

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I have set up the email through Tools => Options => Email.
When I click "test" the email goes through
When I click "test" the second time, then I get the error message "connect to mail.gmx.com:587 failed"
The same happens with my alerts (sent through this MailDispatcher) : the first alert I receive in my email, the subsequent alerts not.
Any idea what the problem might be?