Sorry to spam the list for this, but I was not able to find anything close to a 
technical support email contact on
their web page...

To avoid many round trip mails, here's the problem:

we get incoming mails with senders like <+4176...@mms.sunrise.ch>. 

But:

mms.sunrise.ch.         3600    IN      MX      10 mm3.sunrise.ch.

Host mm3.sunrise.ch not found: 3(NXDOMAIN)


So, those sender addresses are invalid, and get rejected on our mail servers. 
Might want to fix your DNS..

Cheers,
Markus


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