List problems, getting 554

Anyone else experiencing problems with this list? I'm getting:

<xml-sig@...>: host mail.python.org[194.109.207.14] said: 554
permanent error (in reply to end of DATA command)

Rgds,
---
Peter Åstrand ThinLinc Chief Developer
Cendio AB http://www.cendio.com
Wallenbergs gata 4
583 30 Linköping Phone: [phone]
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