"SpamCop has accepted x emails for processing" messages failing SPF check

Hi.

For a few hours, the "SpamCop has accepted n emails for processing" 
notification messages have been failing SPF checks.  The SpamCop website says:

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Bounce Error:
Your email address, [email protected] has returned a bounce:
Subject: Delivery Status Notification (Failure)
Reason: 5.1.0 - Unknown address error 550-'SPF: Please see 
http://spf.pobox.com/why.html?sender=spamid.799296702%40bounces.spamcop.net&ip=204.15.82.27&receiver=io.link-m.de 
'
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The SPF explanation page says:

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io.link-m.de saw a message coming from the IP address 204.15.82.27 which 
is vmx1.spamcop.net; the sender claimed to be 
[email protected].

However, bounces.spamcop.net has announced using SPF that it does not send 
mail out through 204.15.82.27. That is why the mail was rejected.
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The SPF record of bounces.spamcop.net is:

   v=spf1 ip4:64.74.133.224/27 -all

Obviously this doesn't authorize the server that is actually sending the 
notification messages (204.15.82.27 AKA vmx1.spamcop.net).

SpamCop, please fix your SPF record(s).

Yours,
Julian Mehnle.