[swinog] Weird Bluewin Error: 'Unable to verify MX-Record for domain'

Hi List

Has anyone seen this error message and has a clue about the cause?

... while talking to mxbw.lb.bluewin.chhttp://mxbw.lb.bluewin.ch.:

****@bluewin.ch (reason: 550-5.1.0 MAIL FROM: *****@list.scout.ch Unable to verify MX-Record for domain list.scout.ch)

list.scout.ch. 3600 IN MX 50 list.scout.ch. list.scout.ch. 3600 IN A 157.161.57.26 list.scout.ch. 3600 IN AAAA 2001:4060:dead:beef:200:e2ff:fe70:3b2f list.scout.ch. 3600 IN TXT "v=spf1 a:list.scout.ch a:akela.scout.ch a:list.scoutnet.org -all"

Can't find anything wrong with the MX entry. Actually an MX is not even really necessary.

-Benoît-