I've received various bounces from common-lisp.net mailing lists today which looked like this:
host mx.freenet.de[195.4.92.211] said: 550 inconsistent or no DNS PTR record for 80.68.86.115 (see RFC 1912 2.1) (in reply to RCPT TO command)
Is there a problem with the c-l.net DNS setup?
Cheers, Edi.