Bounce error

Hi, Spamcop's Report Spam page declares (instead of usual spam reporting
form):
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Bounce error
Your email address, <removed>@spamcop.net has returned a bounce:
Subject: Delivery Status Notification (Failure)
Reason: 5.1.0 - Unknown address error 550-'5.5.0 Permanent failure,
closing connection. c5si1502657qbc'

Please ensure your email account is reliable, then click below:
[Problem resolved]
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Well, from the given information it is not entirely clear, what should I
do. I have definitely not resolved any problems with any of my e-mail
accounts, so clicking that button does not seem right...

The e-mail address that it reports to bounce, is my spamcop's e-mail
address, so if there is problem with that account, who should I talk
with? Or was it just temporary SMTP server failure and I should go on?

Regards,
Keegi